SELECT 
  SQL_CALC_FOUND_ROWS products.product_id, 
  IF(
    shared_descr.product_id IS NOT NULL, 
    shared_descr.product, descr1.product
  ) as product, 
  companies.company as company_name, 
  products.product_type, 
  products.parent_product_id 
FROM 
  cscart_products as products 
  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 cscart_categories.category_id IN (286, 287, 288, 314, 289) 
  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) 
  AND products.parent_product_id = 0 
GROUP BY 
  products.product_id 
ORDER BY 
  product asc, 
  products.product_id ASC 
LIMIT 
  0, 96

Query time 0.00344

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "15.72"
    },
    "ordering_operation": {
      "using_filesort": true,
      "grouping_operation": {
        "using_temporary_table": true,
        "using_filesort": false,
        "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": 5,
              "rows_produced_per_join": 0,
              "filtered": "4.00",
              "index_condition": "(`gaseus`.`cscart_categories`.`category_id` in (286,287,288,314,289))",
              "cost_info": {
                "read_cost": "3.49",
                "eval_cost": "0.02",
                "prefix_cost": "3.51",
                "data_read_per_join": "822"
              },
              "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": "0.02",
                "prefix_cost": "4.15",
                "data_read_per_join": "1K"
              },
              "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": 22,
              "filtered": "100.00",
              "using_index": true,
              "cost_info": {
                "read_cost": "0.19",
                "eval_cost": "2.20",
                "prefix_cost": "6.54",
                "data_read_per_join": "352"
              },
              "used_columns": [
                "product_id",
                "category_id"
              ]
            }
          },
          {
            "table": {
              "table_name": "products",
              "access_type": "eq_ref",
              "possible_keys": [
                "PRIMARY",
                "status",
                "idx_parent_product_id"
              ],
              "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": 1,
              "filtered": "5.00",
              "cost_info": {
                "read_cost": "5.50",
                "eval_cost": "0.11",
                "prefix_cost": "14.24",
                "data_read_per_join": "7K"
              },
              "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`.`parent_product_id` = 0) 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": 1,
              "filtered": "99.97",
              "using_index": true,
              "cost_info": {
                "read_cost": "0.28",
                "eval_cost": "0.11",
                "prefix_cost": "14.63",
                "data_read_per_join": "26"
              },
              "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": "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": 1,
              "filtered": "100.00",
              "cost_info": {
                "read_cost": "0.32",
                "eval_cost": "0.11",
                "prefix_cost": "15.06",
                "data_read_per_join": "4K"
              },
              "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": 1,
              "filtered": "100.00",
              "cost_info": {
                "read_cost": "0.55",
                "eval_cost": "0.11",
                "prefix_cost": "15.72",
                "data_read_per_join": "5K"
              },
              "used_columns": [
                "product_id",
                "lang_code",
                "product"
              ]
            }
          }
        ]
      }
    }
  }
}

Result

product_id product company_name product_type parent_product_id
6843 Cylinder regulator F10/200 Effect LabLine Gaseus P 0
6840 Cylinder regulator F15 Effect LabLine Gaseus P 0
6841 Cylinder regulator Vulkan F 15/200 Effect LabLine nitrogen Gaseus P 0
6846 Cylinder regulator Vulkan F 15/200 Effect LabLine nitrogen Gaseus P 0
3430 Linde In-line regulator L 20 Inertgase, Klemmring 12 mm, 0 - 20 bar Gaseus P 0
3429 Linde In-line regulator LDR-40-20-90 H2 Gaseus P 0
3437 Linde In-line regulator LDR-40-20-90 H2 Gaseus P 0
3436 Linde In-line regulator LDR-40-20-90 N2 Gaseus P 0
3438 Linde In-Line Regulator LDR-40-20-90 O2 Gaseus P 0
3477 Linde Pressure regulator FDR-200-L-20-EG Gaseus P 0
3452 Linde Pressure regulator FDR-200-L-22-FG Gaseus P 0
3478 Linde Pressure regulator FDR-200-L-30-EG Gaseus P 0
3479 Linde Pressure regulator FDR-200-L-30-MISON Gaseus P 0
3453 Linde Pressure regulator FDR-200-L-50-FG Gaseus P 0
3491 Linde Pressure regulator FDR-300-10-48-H2 Gaseus P 0
3488 Linde Pressure regulator FDR-300-10-48-N2 Gaseus P 0
3497 Linde Pressure regulator FDR-300-10-48-O2 Gaseus P 0
3495 Linde Pressure regulator FDR-300-100-380-EG Gaseus P 0
3489 Linde Pressure regulator FDR-300-100-380-N2 Gaseus P 0
3492 Linde Pressure regulator FDR-300-20-75-H2/FG Gaseus P 0
3496 Linde Pressure regulator FDR-300-200-380-EG Gaseus P 0
3490 Linde Pressure regulator FDR-300-200-380-N2 Gaseus P 0
3494 Linde Pressure regulator FDR-300-60-140-N2/Ar Gaseus P 0
6951 Linde Pressure regulator FDR-300-F-32-EG Gaseus P 0
3502 Linde Pressure regulator FDR-300-F-32-FG Gaseus P 0
3503 Linde Pressure regulator FDR-300-L-30-EG Gaseus P 0
3493 Linde Pressure regulator FDR-300-L-50-FG Gaseus P 0
3498 Linde Pressure regulator LHR300/100 Gaseus P 0
3428 Linde Pressure Regulator MINICAN Gaseus P 0
3419 Line pressure regulator L10 LabLine Gaseus P 0
3418 Line pressure regulator L10/2 Labline Gaseus P 0
6946 Line pressure regulator L15 LabLine Gaseus P 0
6945 Line pressure regulator L15/2 LabLine Gaseus P 0
3411 Line pressure regulator Vulkan L 10 LabLine Nitrogen Gaseus P 0
3415 Line pressure regulator Vulkan L 10 LabLine Nitrogen Gaseus P 0
3417 Line pressure regulator Vulkan L 10 LabLine Nitrogen Gaseus P 0
6942 Line pressure regulator Vulkan L 10 LabLine Nitrogen Gaseus P 0
3410 Line pressure regulator Vulkan L 10/2 Labline Nitrogen Gaseus P 0
3413 Line pressure regulator Vulkan L 10/2 Labline Nitrogen Gaseus P 0
3416 Line pressure regulator Vulkan L 10/2 Labline Nitrogen Gaseus P 0
6940 Line pressure regulator Vulkan L 10/2 Labline Nitrogen Gaseus P 0
3414 Line pressure regulator Vulkan L 15 LabLine Nitrogen Gaseus P 0
6938 Line pressure regulator Vulkan L 15 LabLine Nitrogen Gaseus P 0
6941 Line pressure regulator Vulkan L 15 LabLine Nitrogen Gaseus P 0
6944 Line pressure regulator Vulkan L 15 LabLine Nitrogen Gaseus P 0
3412 Line pressure regulator Vulkan L 15/2 LabLine Nitrogen Gaseus P 0
6937 Line pressure regulator Vulkan L 15/2 LabLine Nitrogen Gaseus P 0
6939 Line pressure regulator Vulkan L 15/2 LabLine Nitrogen Gaseus P 0
6943 Line pressure regulator Vulkan L 15/2 LabLine Nitrogen Gaseus P 0
3165 Point-of-use regulator E10F LabLine Gaseus P 0
3139 Point-of-use regulator with flowmeter Argon/CO₂ 1-15 Nl/min Vulkan E10F LabLine Gaseus P 0
3140 Point-of-use regulator with flowmeter Argon/CO₂ 1-15 Nl/min Vulkan E10F LabLine Gaseus P 0
6712 Point-of-use regulator with flowmeter Argon/CO₂ 1-15 Nl/min Vulkan E10F LabLine Gaseus P 0
6713 Point-of-use regulator with flowmeter Argon/CO₂ 1-15 Nl/min Vulkan E10F LabLine Gaseus P 0
5802 TEST Cylinder Regulator Gastech Sigma 1BCH single-stage 200 bar Gaseus P 0