SELECT 
  SQL_CALC_FOUND_ROWS (
    CASE WHEN products.parent_product_id <> 0 THEN products.parent_product_id ELSE products.product_id END
  ) AS product_id, 
  IF(
    shared_descr.product_id IS NOT NULL, 
    shared_descr.product, descr1.product
  ) as product, 
  companies.company as company_name, 
  GROUP_CONCAT(
    products.product_id 
    ORDER BY 
      products.parent_product_id ASC, 
      products.product_id ASC
  ) AS product_ids, 
  GROUP_CONCAT(
    products.product_type 
    ORDER BY 
      products.parent_product_id ASC, 
      products.product_id ASC
  ) AS product_types, 
  GROUP_CONCAT(
    products.parent_product_id 
    ORDER BY 
      products.parent_product_id ASC, 
      products.product_id ASC
  ) AS parent_product_ids, 
  products.product_type, 
  products.parent_product_id 
FROM 
  cscart_products as products 
  LEFT JOIN cscart_product_features_values as var_val_18 ON var_val_18.product_id = products.product_id 
  AND var_val_18.lang_code = 'en' 
  AND var_val_18.feature_id = 18 
  LEFT JOIN cscart_product_descriptions as descr1 ON descr1.product_id = products.product_id 
  AND descr1.lang_code = 'en' 
  LEFT JOIN cscart_product_prices as prices ON prices.product_id = products.product_id 
  AND prices.lower_limit = 1 
  LEFT JOIN cscart_companies AS companies ON companies.company_id = products.company_id 
  INNER JOIN cscart_products_categories as products_categories ON products_categories.product_id = products.product_id 
  INNER JOIN cscart_categories ON cscart_categories.category_id = products_categories.category_id 
  AND (
    cscart_categories.usergroup_ids = '' 
    OR FIND_IN_SET(
      0, cscart_categories.usergroup_ids
    ) 
    OR FIND_IN_SET(
      1, cscart_categories.usergroup_ids
    )
  ) 
  AND cscart_categories.status IN ('A', 'H') 
  AND cscart_categories.storefront_id IN (0, 1) 
  LEFT JOIN cscart_ult_product_descriptions shared_descr ON shared_descr.product_id = products.product_id 
  AND shared_descr.company_id = 1 
  AND shared_descr.lang_code = 'en' 
WHERE 
  1 
  AND (
    var_val_18.variant_id IN (1202)
  ) 
  AND cscart_categories.category_id IN (273) 
  AND companies.status IN ('A') 
  AND (
    products.usergroup_ids = '' 
    OR FIND_IN_SET(0, products.usergroup_ids) 
    OR FIND_IN_SET(1, products.usergroup_ids)
  ) 
  AND products.status IN ('A') 
  AND prices.usergroup_id IN (0, 0, 1) 
GROUP BY 
  product_id 
ORDER BY 
  product asc, 
  products.product_id ASC 
LIMIT 
  384, 48

Query time 0.02432

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "1015.36"
    },
    "ordering_operation": {
      "using_filesort": true,
      "grouping_operation": {
        "using_temporary_table": true,
        "using_filesort": true,
        "buffer_result": {
          "using_temporary_table": true,
          "nested_loop": [
            {
              "table": {
                "table_name": "cscart_categories",
                "access_type": "const",
                "possible_keys": [
                  "PRIMARY",
                  "c_status",
                  "p_category_id"
                ],
                "key": "PRIMARY",
                "used_key_parts": [
                  "category_id"
                ],
                "key_length": "3",
                "ref": [
                  "const"
                ],
                "rows_examined_per_scan": 1,
                "rows_produced_per_join": 1,
                "filtered": "100.00",
                "cost_info": {
                  "read_cost": "0.00",
                  "eval_cost": "0.10",
                  "prefix_cost": "0.00",
                  "data_read_per_join": "4K"
                },
                "used_columns": [
                  "category_id",
                  "storefront_id",
                  "usergroup_ids",
                  "status"
                ]
              }
            },
            {
              "table": {
                "table_name": "companies",
                "access_type": "ALL",
                "possible_keys": [
                  "PRIMARY"
                ],
                "rows_examined_per_scan": 2,
                "rows_produced_per_join": 1,
                "filtered": "50.00",
                "cost_info": {
                  "read_cost": "0.62",
                  "eval_cost": "0.10",
                  "prefix_cost": "0.72",
                  "data_read_per_join": "5K"
                },
                "used_columns": [
                  "company_id",
                  "status",
                  "company"
                ],
                "attached_condition": "(`gaseus`.`companies`.`status` = 'A')"
              }
            },
            {
              "table": {
                "table_name": "products_categories",
                "access_type": "ref",
                "possible_keys": [
                  "PRIMARY",
                  "pt"
                ],
                "key": "PRIMARY",
                "used_key_parts": [
                  "category_id"
                ],
                "key_length": "3",
                "ref": [
                  "const"
                ],
                "rows_examined_per_scan": 1621,
                "rows_produced_per_join": 1621,
                "filtered": "100.00",
                "using_index": true,
                "cost_info": {
                  "read_cost": "10.38",
                  "eval_cost": "162.10",
                  "prefix_cost": "173.20",
                  "data_read_per_join": "25K"
                },
                "used_columns": [
                  "product_id",
                  "category_id"
                ]
              }
            },
            {
              "table": {
                "table_name": "products",
                "access_type": "eq_ref",
                "possible_keys": [
                  "PRIMARY",
                  "status"
                ],
                "key": "PRIMARY",
                "used_key_parts": [
                  "product_id"
                ],
                "key_length": "3",
                "ref": [
                  "gaseus.products_categories.product_id"
                ],
                "rows_examined_per_scan": 1,
                "rows_produced_per_join": 162,
                "filtered": "10.00",
                "cost_info": {
                  "read_cost": "405.25",
                  "eval_cost": "16.20",
                  "prefix_cost": "740.55",
                  "data_read_per_join": "1M"
                },
                "used_columns": [
                  "product_id",
                  "product_type",
                  "status",
                  "company_id",
                  "usergroup_ids",
                  "parent_product_id"
                ],
                "attached_condition": "((`gaseus`.`products`.`company_id` = `gaseus`.`companies`.`company_id`) and ((`gaseus`.`products`.`usergroup_ids` = '') or (0 <> find_in_set(0,`gaseus`.`products`.`usergroup_ids`)) or (0 <> find_in_set(1,`gaseus`.`products`.`usergroup_ids`))) and (`gaseus`.`products`.`status` = 'A'))"
              }
            },
            {
              "table": {
                "table_name": "prices",
                "access_type": "ref",
                "possible_keys": [
                  "usergroup",
                  "product_id",
                  "lower_limit",
                  "usergroup_id"
                ],
                "key": "usergroup",
                "used_key_parts": [
                  "product_id"
                ],
                "key_length": "3",
                "ref": [
                  "gaseus.products_categories.product_id"
                ],
                "rows_examined_per_scan": 1,
                "rows_produced_per_join": 161,
                "filtered": "99.97",
                "using_index": true,
                "cost_info": {
                  "read_cost": "40.51",
                  "eval_cost": "16.20",
                  "prefix_cost": "797.26",
                  "data_read_per_join": "3K"
                },
                "used_columns": [
                  "product_id",
                  "lower_limit",
                  "usergroup_id"
                ],
                "attached_condition": "((`gaseus`.`prices`.`lower_limit` = 1) and (`gaseus`.`prices`.`usergroup_id` in (0,0,1)))"
              }
            },
            {
              "table": {
                "table_name": "var_val_18",
                "access_type": "eq_ref",
                "possible_keys": [
                  "PRIMARY",
                  "fl",
                  "variant_id",
                  "lang_code",
                  "product_id",
                  "fpl",
                  "idx_product_feature_variant_id"
                ],
                "key": "PRIMARY",
                "used_key_parts": [
                  "feature_id",
                  "product_id",
                  "variant_id",
                  "lang_code"
                ],
                "key_length": "15",
                "ref": [
                  "const",
                  "gaseus.products_categories.product_id",
                  "const",
                  "const"
                ],
                "rows_examined_per_scan": 1,
                "rows_produced_per_join": 161,
                "filtered": "100.00",
                "using_index": true,
                "cost_info": {
                  "read_cost": "40.50",
                  "eval_cost": "16.20",
                  "prefix_cost": "853.96",
                  "data_read_per_join": "125K"
                },
                "used_columns": [
                  "feature_id",
                  "product_id",
                  "variant_id",
                  "lang_code"
                ]
              }
            },
            {
              "table": {
                "table_name": "shared_descr",
                "access_type": "eq_ref",
                "possible_keys": [
                  "PRIMARY",
                  "product_id",
                  "company_id"
                ],
                "key": "PRIMARY",
                "used_key_parts": [
                  "product_id",
                  "lang_code",
                  "company_id"
                ],
                "key_length": "13",
                "ref": [
                  "gaseus.products_categories.product_id",
                  "const",
                  "const"
                ],
                "rows_examined_per_scan": 1,
                "rows_produced_per_join": 161,
                "filtered": "100.00",
                "cost_info": {
                  "read_cost": "47.67",
                  "eval_cost": "16.20",
                  "prefix_cost": "917.83",
                  "data_read_per_join": "617K"
                },
                "used_columns": [
                  "product_id",
                  "lang_code",
                  "company_id",
                  "product"
                ]
              }
            },
            {
              "table": {
                "table_name": "descr1",
                "access_type": "eq_ref",
                "possible_keys": [
                  "PRIMARY",
                  "product_id"
                ],
                "key": "PRIMARY",
                "used_key_parts": [
                  "product_id",
                  "lang_code"
                ],
                "key_length": "9",
                "ref": [
                  "gaseus.products_categories.product_id",
                  "const"
                ],
                "rows_examined_per_scan": 1,
                "rows_produced_per_join": 161,
                "filtered": "100.00",
                "cost_info": {
                  "read_cost": "81.33",
                  "eval_cost": "16.20",
                  "prefix_cost": "1015.36",
                  "data_read_per_join": "739K"
                },
                "used_columns": [
                  "product_id",
                  "lang_code",
                  "product"
                ]
              }
            }
          ]
        }
      }
    }
  }
}

Result

product_id product company_name product_ids product_types parent_product_ids product_type parent_product_id
211 Line pressure regulator Nitrogen 0-20 bar Vulkan L20 Gaseus 211 P 0 P 0
212 Line pressure regulator Nitrogen 0-20 bar Vulkan L20 Gaseus 212 P 0 P 0
213 Line pressure regulator Nitrogen 0-20 bar Vulkan L20 Gaseus 213 P 0 P 0
214 Line pressure regulator Nitrogen 0-20 bar Vulkan L20 Gaseus 214 P 0 P 0
215 Line pressure regulator Nitrogen 0-20 bar Vulkan L20 Gaseus 215 P 0 P 0
216 Line pressure regulator Nitrogen 0-20 bar Vulkan L20 Gaseus 216 P 0 P 0
217 Line pressure regulator Nitrogen 0-20 bar Vulkan L20 Gaseus 217 P 0 P 0
218 Line pressure regulator Nitrogen 0-20 bar Vulkan L20 Gaseus 218 P 0 P 0
219 Line pressure regulator Nitrogen 0-20 bar Vulkan L20 Gaseus 219 P 0 P 0
220 Line pressure regulator Nitrogen 0-20 bar Vulkan L20 Gaseus 220 P 0 P 0
221 Line pressure regulator Nitrogen 0-20 bar Vulkan L20 Gaseus 221 P 0 P 0
222 Line pressure regulator Nitrogen 0-20 bar Vulkan L20 Gaseus 222 P 0 P 0
223 Line pressure regulator Nitrogen 0-20 bar Vulkan L20 Gaseus 223 P 0 P 0
278 Line pressure regulator Nitrogen 0-20 bar Vulkan L20 Gaseus 278 P 0 P 0
279 Line pressure regulator Nitrogen 0-20 bar Vulkan L20 Gaseus 279 P 0 P 0
280 Line pressure regulator Nitrogen 0-20 bar Vulkan L20 Gaseus 280 P 0 P 0
281 Line pressure regulator Nitrogen 0-20 bar Vulkan L20 Gaseus 281 P 0 P 0
282 Line pressure regulator Nitrogen 0-20 bar Vulkan L20 Gaseus 282 P 0 P 0
283 Line pressure regulator Nitrogen 0-20 bar Vulkan L20 Gaseus 283 P 0 P 0
284 Line pressure regulator Nitrogen 0-20 bar Vulkan L20 Gaseus 284 P 0 P 0
332 Line pressure regulator Nitrogen 0-20 bar Vulkan L20 Gaseus 332 P 0 P 0
333 Line pressure regulator Nitrogen 0-20 bar Vulkan L20 Gaseus 333 P 0 P 0
334 Line pressure regulator Nitrogen 0-20 bar Vulkan L20 Gaseus 334 P 0 P 0
335 Line pressure regulator Nitrogen 0-20 bar Vulkan L20 Gaseus 335 P 0 P 0
336 Line pressure regulator Nitrogen 0-20 bar Vulkan L20 Gaseus 336 P 0 P 0
337 Line pressure regulator Nitrogen 0-20 bar Vulkan L20 Gaseus 337 P 0 P 0
3915 Line pressure regulator Nitrogen 0-20 bar Vulkan L20 Gaseus 3915 P 0 P 0
3916 Line pressure regulator Nitrogen 0-20 bar Vulkan L20 Gaseus 3916 P 0 P 0
3917 Line pressure regulator Nitrogen 0-20 bar Vulkan L20 Gaseus 3917 P 0 P 0
3918 Line pressure regulator Nitrogen 0-20 bar Vulkan L20 Gaseus 3918 P 0 P 0
3919 Line pressure regulator Nitrogen 0-20 bar Vulkan L20 Gaseus 3919 P 0 P 0
3920 Line pressure regulator Nitrogen 0-20 bar Vulkan L20 Gaseus 3920 P 0 P 0
3921 Line pressure regulator Nitrogen 0-20 bar Vulkan L20 Gaseus 3921 P 0 P 0
3968 Line pressure regulator Nitrogen 0-20 bar Vulkan L20 Gaseus 3968 P 0 P 0
3969 Line pressure regulator Nitrogen 0-20 bar Vulkan L20 Gaseus 3969 P 0 P 0
3970 Line pressure regulator Nitrogen 0-20 bar Vulkan L20 Gaseus 3970 P 0 P 0
3971 Line pressure regulator Nitrogen 0-20 bar Vulkan L20 Gaseus 3971 P 0 P 0
3972 Line pressure regulator Nitrogen 0-20 bar Vulkan L20 Gaseus 3972 P 0 P 0
3973 Line pressure regulator Nitrogen 0-20 bar Vulkan L20 Gaseus 3973 P 0 P 0
3974 Line pressure regulator Nitrogen 0-20 bar Vulkan L20 Gaseus 3974 P 0 P 0
4020 Line pressure regulator Nitrogen 0-20 bar Vulkan L20 Gaseus 4020 P 0 P 0
4021 Line pressure regulator Nitrogen 0-20 bar Vulkan L20 Gaseus 4021 P 0 P 0
4022 Line pressure regulator Nitrogen 0-20 bar Vulkan L20 Gaseus 4022 P 0 P 0
4023 Line pressure regulator Nitrogen 0-20 bar Vulkan L20 Gaseus 4023 P 0 P 0
4024 Line pressure regulator Nitrogen 0-20 bar Vulkan L20 Gaseus 4024 P 0 P 0
4025 Line pressure regulator Nitrogen 0-20 bar Vulkan L20 Gaseus 4025 P 0 P 0
4026 Line pressure regulator Nitrogen 0-20 bar Vulkan L20 Gaseus 4026 P 0 P 0
4094 Line pressure regulator Nitrogen 0-20 bar Vulkan L20 Gaseus 4094 P 0 P 0