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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 (287, 314) 
  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 
  0, 12

Query time 0.00573

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "7.57"
    },
    "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": "range",
                "possible_keys": [
                  "PRIMARY",
                  "c_status",
                  "p_category_id"
                ],
                "key": "PRIMARY",
                "used_key_parts": [
                  "category_id"
                ],
                "key_length": "3",
                "rows_examined_per_scan": 2,
                "rows_produced_per_join": 0,
                "filtered": "4.00",
                "index_condition": "(`gaseus`.`cscart_categories`.`category_id` in (287,314))",
                "cost_info": {
                  "read_cost": "1.40",
                  "eval_cost": "0.01",
                  "prefix_cost": "1.41",
                  "data_read_per_join": "328"
                },
                "used_columns": [
                  "category_id",
                  "storefront_id",
                  "usergroup_ids",
                  "status"
                ],
                "attached_condition": "(((`gaseus`.`cscart_categories`.`usergroup_ids` = '') or (0 <> find_in_set(0,`gaseus`.`cscart_categories`.`usergroup_ids`)) or (0 <> find_in_set(1,`gaseus`.`cscart_categories`.`usergroup_ids`))) and (`gaseus`.`cscart_categories`.`status` in ('A','H')) and (`gaseus`.`cscart_categories`.`storefront_id` in (0,1)))"
              }
            },
            {
              "table": {
                "table_name": "companies",
                "access_type": "ALL",
                "possible_keys": [
                  "PRIMARY"
                ],
                "rows_examined_per_scan": 2,
                "rows_produced_per_join": 0,
                "filtered": "50.00",
                "using_join_buffer": "hash join",
                "cost_info": {
                  "read_cost": "0.62",
                  "eval_cost": "0.01",
                  "prefix_cost": "2.04",
                  "data_read_per_join": "444"
                },
                "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": [
                  "gaseus.cscart_categories.category_id"
                ],
                "rows_examined_per_scan": 110,
                "rows_produced_per_join": 8,
                "filtered": "100.00",
                "using_index": true,
                "cost_info": {
                  "read_cost": "0.07",
                  "eval_cost": "0.88",
                  "prefix_cost": "3.00",
                  "data_read_per_join": "140"
                },
                "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": 0,
                "filtered": "10.00",
                "cost_info": {
                  "read_cost": "2.20",
                  "eval_cost": "0.09",
                  "prefix_cost": "6.08",
                  "data_read_per_join": "5K"
                },
                "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": 0,
                "filtered": "99.97",
                "using_index": true,
                "cost_info": {
                  "read_cost": "0.22",
                  "eval_cost": "0.09",
                  "prefix_cost": "6.38",
                  "data_read_per_join": "21"
                },
                "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": 0,
                "filtered": "100.00",
                "using_index": true,
                "cost_info": {
                  "read_cost": "0.22",
                  "eval_cost": "0.09",
                  "prefix_cost": "6.69",
                  "data_read_per_join": "696"
                },
                "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": 0,
                "filtered": "100.00",
                "cost_info": {
                  "read_cost": "0.26",
                  "eval_cost": "0.09",
                  "prefix_cost": "7.04",
                  "data_read_per_join": "3K"
                },
                "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": 0,
                "filtered": "100.00",
                "cost_info": {
                  "read_cost": "0.44",
                  "eval_cost": "0.09",
                  "prefix_cost": "7.57",
                  "data_read_per_join": "4K"
                },
                "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
6843	Cylinder regulator F10/200 Effect LabLine	Gaseus	6843,3166,3167,3168,3169,3171,3172,3174,3175,3176,3177,3180,3181,3182,3183,3184,3185,3186,3187,3190,3191,3192,3193,3194,3195,3197,3198,3271,3272,3273,3275,3278,3279,3280,3281,3282,3283,3284,3288,3289,3291,3294,3295,3865,6737,6738,6739,6740,6741,6742,6743,6745,6746,6747,6748,6751,6752,6753,6754,6755,6756,6757,6758,6759,6763,6765,6766,6769,6820,6821,6823,6826,6827,6828,6829,6830,6831,6832,6835,6836,6837,6838,6839,6842,7008,7009,7032,7033,7034,7071,7072,7095,7096,7110,7111,7112,7113,7180,7181,7182	P,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V	0,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843,6843	V	6843
3315	Cylinder regulator F10/200 Effect LabLine	Gaseus	7108,7109	V,V	3315,3315	V	3315
6840	Cylinder regulator F15 Effect LabLine	Gaseus	6840,3178,3188,3196,3274,3276,3285,3286,3290,3292,6744,6749,6760,6767,6824,6833,7278,7351,7353,7355,7357,7359	P,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V	0,6840,6840,6840,6840,6840,6840,6840,6840,6840,6840,6840,6840,6840,6840,6840,6840,6840,6840,6840,6840,6840	V	6840
6841	Cylinder regulator Vulkan F 15/200 Effect LabLine nitrogen	Gaseus	6841	P	0	P	0
6846	Cylinder regulator Vulkan F 15/200 Effect LabLine nitrogen	Gaseus	6846	P	0	P	0