SELECT 
  products.product_id, 
  products.list_price, 
  prices.price, 
  products.amount, 
  descr1.product as product, 
  companies.company as company_name, 
  products.product_type, 
  products.parent_product_id, 
  products.company_id, 
  prpd.average_rating, 
  prpd.reviews_count, 
  pvd.variant as brand_name, 
  ab.amount as co_purchase_count 
FROM 
  cscart_also_bought_products ab 
  INNER JOIN cscart_products as products ON products.product_id = ab.related_id 
  AND products.status = 'A' 
  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 
  LEFT JOIN cscart_product_review_prepared_data AS prpd ON prpd.product_id = products.product_id 
  LEFT JOIN cscart_product_features_values AS pfv ON pfv.product_id = products.product_id 
  AND pfv.feature_id = 62 
  LEFT JOIN cscart_product_feature_variant_descriptions AS pvd ON pfv.variant_id = pvd.variant_id 
  AND pvd.lang_code = 'en' 
WHERE 
  ab.product_id = 3976 
  AND ab.amount >= 2 
  AND products.parent_product_id = 0 
  AND (
    products.amount > 0 
    OR products.tracking = 'D'
  ) 
GROUP BY 
  products.product_id 
ORDER BY 
  ab.amount DESC 
LIMIT 
  8

Query time 0.00303

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "146.92"
    },
    "ordering_operation": {
      "using_filesort": true,
      "grouping_operation": {
        "using_temporary_table": true,
        "using_filesort": false,
        "nested_loop": [
          {
            "table": {
              "table_name": "ab",
              "access_type": "ref",
              "possible_keys": [
                "PRIMARY"
              ],
              "key": "PRIMARY",
              "used_key_parts": [
                "product_id"
              ],
              "key_length": "3",
              "ref": [
                "const"
              ],
              "rows_examined_per_scan": 488,
              "rows_produced_per_join": 162,
              "filtered": "33.33",
              "cost_info": {
                "read_cost": "1.39",
                "eval_cost": "16.27",
                "prefix_cost": "50.19",
                "data_read_per_join": "2K"
              },
              "used_columns": [
                "product_id",
                "related_id",
                "amount"
              ],
              "attached_condition": "(`cscart_db`.`ab`.`amount` >= 2)"
            }
          },
          {
            "table": {
              "table_name": "products",
              "access_type": "eq_ref",
              "possible_keys": [
                "PRIMARY",
                "age_verification",
                "status",
                "idx_parent_product_id",
                "idx_master_product_id",
                "youtube_link",
                "idx_products_parent_lookup",
                "idx_products_status_company",
                "idx_products_master_status",
                "idx_products_inventory",
                "idx_products_status_company_master",
                "idx_products_main_query",
                "idx_products_query_opt",
                "idx_products_composite_query",
                "idx_kl_qc_enabled"
              ],
              "key": "PRIMARY",
              "used_key_parts": [
                "product_id"
              ],
              "key_length": "3",
              "ref": [
                "cscart_db.ab.related_id"
              ],
              "rows_examined_per_scan": 1,
              "rows_produced_per_join": 8,
              "filtered": "5.43",
              "cost_info": {
                "read_cost": "43.02",
                "eval_cost": "0.88",
                "prefix_cost": "109.48",
                "data_read_per_join": "46K"
              },
              "used_columns": [
                "product_id",
                "product_type",
                "status",
                "company_id",
                "list_price",
                "amount",
                "tracking",
                "parent_product_id"
              ],
              "attached_condition": "((`cscart_db`.`products`.`parent_product_id` = 0) and ((`cscart_db`.`products`.`amount` > 0) or (`cscart_db`.`products`.`tracking` = 'D')) and (`cscart_db`.`products`.`status` = 'A'))"
            }
          },
          {
            "table": {
              "table_name": "descr1",
              "access_type": "eq_ref",
              "possible_keys": [
                "PRIMARY",
                "product_id",
                "idx_product_desc_lang",
                "idx_product_name_search",
                "idx_product_desc_sort"
              ],
              "key": "PRIMARY",
              "used_key_parts": [
                "product_id",
                "lang_code"
              ],
              "key_length": "9",
              "ref": [
                "cscart_db.ab.related_id",
                "const"
              ],
              "rows_examined_per_scan": 1,
              "rows_produced_per_join": 8,
              "filtered": "100.00",
              "cost_info": {
                "read_cost": "6.03",
                "eval_cost": "0.88",
                "prefix_cost": "116.40",
                "data_read_per_join": "40K"
              },
              "used_columns": [
                "product_id",
                "lang_code",
                "product"
              ]
            }
          },
          {
            "table": {
              "table_name": "prices",
              "access_type": "ref",
              "possible_keys": [
                "usergroup",
                "product_id",
                "lower_limit",
                "idx_prices_discount_lookup",
                "idx_prices_min_calc",
                "idx_prices_usergroup_lookup"
              ],
              "key": "idx_prices_discount_lookup",
              "used_key_parts": [
                "product_id",
                "lower_limit"
              ],
              "key_length": "6",
              "ref": [
                "cscart_db.ab.related_id",
                "const"
              ],
              "rows_examined_per_scan": 1,
              "rows_produced_per_join": 8,
              "filtered": "100.00",
              "using_index": true,
              "cost_info": {
                "read_cost": "2.32",
                "eval_cost": "0.88",
                "prefix_cost": "119.60",
                "data_read_per_join": "212"
              },
              "used_columns": [
                "product_id",
                "price",
                "lower_limit",
                "usergroup_id"
              ]
            }
          },
          {
            "table": {
              "table_name": "companies",
              "access_type": "eq_ref",
              "possible_keys": [
                "PRIMARY"
              ],
              "key": "PRIMARY",
              "used_key_parts": [
                "company_id"
              ],
              "key_length": "4",
              "ref": [
                "cscart_db.products.company_id"
              ],
              "rows_examined_per_scan": 1,
              "rows_produced_per_join": 8,
              "filtered": "100.00",
              "cost_info": {
                "read_cost": "2.21",
                "eval_cost": "0.88",
                "prefix_cost": "122.69",
                "data_read_per_join": "61K"
              },
              "used_columns": [
                "company_id",
                "company"
              ]
            }
          },
          {
            "table": {
              "table_name": "prpd",
              "access_type": "ref",
              "possible_keys": [
                "PRIMARY"
              ],
              "key": "PRIMARY",
              "used_key_parts": [
                "product_id"
              ],
              "key_length": "3",
              "ref": [
                "cscart_db.ab.related_id"
              ],
              "rows_examined_per_scan": 1,
              "rows_produced_per_join": 17,
              "filtered": "100.00",
              "cost_info": {
                "read_cost": "2.60",
                "eval_cost": "1.77",
                "prefix_cost": "127.05",
                "data_read_per_join": "282"
              },
              "used_columns": [
                "product_id",
                "storefront_id",
                "average_rating",
                "reviews_count"
              ]
            }
          },
          {
            "table": {
              "table_name": "pfv",
              "access_type": "ref",
              "possible_keys": [
                "PRIMARY",
                "product_id",
                "fpl",
                "idx_product_feature_variant_id",
                "fl"
              ],
              "key": "idx_product_feature_variant_id",
              "used_key_parts": [
                "product_id",
                "feature_id"
              ],
              "key_length": "6",
              "ref": [
                "cscart_db.ab.related_id",
                "const"
              ],
              "rows_examined_per_scan": 1,
              "rows_produced_per_join": 21,
              "filtered": "100.00",
              "using_index": true,
              "cost_info": {
                "read_cost": "10.26",
                "eval_cost": "2.12",
                "prefix_cost": "139.44",
                "data_read_per_join": "849"
              },
              "used_columns": [
                "feature_id",
                "product_id",
                "variant_id",
                "lang_code"
              ]
            }
          },
          {
            "table": {
              "table_name": "pvd",
              "access_type": "eq_ref",
              "possible_keys": [
                "PRIMARY"
              ],
              "key": "PRIMARY",
              "used_key_parts": [
                "variant_id",
                "lang_code"
              ],
              "key_length": "9",
              "ref": [
                "cscart_db.pfv.variant_id",
                "const"
              ],
              "rows_examined_per_scan": 1,
              "rows_produced_per_join": 21,
              "filtered": "100.00",
              "cost_info": {
                "read_cost": "5.36",
                "eval_cost": "2.12",
                "prefix_cost": "146.92",
                "data_read_per_join": "158K"
              },
              "used_columns": [
                "variant_id",
                "variant",
                "lang_code"
              ]
            }
          }
        ]
      }
    }
  }
}