SELECT 
  cscart_products_categories.product_id, 
  GROUP_CONCAT(
    IF(
      cscart_products_categories.link_type = "M", 
      CONCAT(
        cscart_products_categories.category_id, 
        "M"
      ), 
      cscart_products_categories.category_id
    )
  ) AS category_ids, 
  product_position_source.position AS position 
FROM 
  cscart_products_categories 
  INNER JOIN cscart_categories ON cscart_categories.category_id = cscart_products_categories.category_id 
  AND cscart_categories.storefront_id IN (0, 1) 
  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') 
  LEFT JOIN cscart_products_categories AS product_position_source ON cscart_products_categories.product_id = product_position_source.product_id 
  AND product_position_source.category_id = 7168 
WHERE 
  cscart_products_categories.product_id IN (
    87372, 89543, 82487, 89532, 89540, 82492, 
    87371, 89546, 89538, 89554, 91481, 
    85620, 85634, 91480, 89544, 85618, 
    89542, 85616, 85619, 85633, 82491, 
    89563, 85617, 82490, 85615, 82489, 
    91478, 82488, 91479, 85638, 85637, 
    85636, 85635, 92560, 92561, 92562, 
    92563, 92564, 92565, 92566, 92567, 
    92568, 92569, 92570, 92571, 92572, 
    92573, 92574, 92575, 92576, 92577, 
    92578, 92579, 92580, 92581, 92582, 
    92583, 92584, 92585, 92586, 92587, 
    92588, 92589, 92590, 92591, 92592, 
    93296, 93297, 93298, 93299, 93300, 
    93301, 93302, 93303, 93304, 93305, 
    93306, 93307, 93308, 93309, 93310, 
    93311, 93312, 93313, 93314, 93315, 
    93316, 93317, 93318, 93319, 93320, 
    93321, 93322, 93323, 93324, 93325
  ) 
GROUP BY 
  cscart_products_categories.product_id

Query time 0.00188

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "54.77"
    },
    "grouping_operation": {
      "using_filesort": false,
      "nested_loop": [
        {
          "table": {
            "table_name": "cscart_products_categories",
            "access_type": "range",
            "possible_keys": [
              "PRIMARY",
              "link_type",
              "pt"
            ],
            "key": "pt",
            "used_key_parts": [
              "product_id"
            ],
            "key_length": "3",
            "rows_examined_per_scan": 96,
            "rows_produced_per_join": 96,
            "filtered": "100.00",
            "using_index": true,
            "cost_info": {
              "read_cost": "9.89",
              "eval_cost": "9.60",
              "prefix_cost": "19.49",
              "data_read_per_join": "1K"
            },
            "used_columns": [
              "product_id",
              "category_id",
              "link_type"
            ],
            "attached_condition": "(`nuie_scalesta_net`.`cscart_products_categories`.`product_id` in (87372,89543,82487,89532,89540,82492,87371,89546,89538,89554,91481,85620,85634,91480,89544,85618,89542,85616,85619,85633,82491,89563,85617,82490,85615,82489,91478,82488,91479,85638,85637,85636,85635,92560,92561,92562,92563,92564,92565,92566,92567,92568,92569,92570,92571,92572,92573,92574,92575,92576,92577,92578,92579,92580,92581,92582,92583,92584,92585,92586,92587,92588,92589,92590,92591,92592,93296,93297,93298,93299,93300,93301,93302,93303,93304,93305,93306,93307,93308,93309,93310,93311,93312,93313,93314,93315,93316,93317,93318,93319,93320,93321,93322,93323,93324,93325))"
          }
        },
        {
          "table": {
            "table_name": "cscart_categories",
            "access_type": "eq_ref",
            "possible_keys": [
              "PRIMARY",
              "c_status",
              "p_category_id"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
              "category_id"
            ],
            "key_length": "3",
            "ref": [
              "nuie_scalesta_net.cscart_products_categories.category_id"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 4,
            "filtered": "5.00",
            "cost_info": {
              "read_cost": "24.00",
              "eval_cost": "0.48",
              "prefix_cost": "53.09",
              "data_read_per_join": "12K"
            },
            "used_columns": [
              "category_id",
              "usergroup_ids",
              "status",
              "storefront_id"
            ],
            "attached_condition": "((`nuie_scalesta_net`.`cscart_categories`.`storefront_id` in (0,1)) and ((`nuie_scalesta_net`.`cscart_categories`.`usergroup_ids` = '') or (0 <> find_in_set(0,`nuie_scalesta_net`.`cscart_categories`.`usergroup_ids`)) or (0 <> find_in_set(1,`nuie_scalesta_net`.`cscart_categories`.`usergroup_ids`))) and (`nuie_scalesta_net`.`cscart_categories`.`status` in ('A','H')))"
          }
        },
        {
          "table": {
            "table_name": "product_position_source",
            "access_type": "eq_ref",
            "possible_keys": [
              "PRIMARY",
              "pt"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
              "category_id",
              "product_id"
            ],
            "key_length": "6",
            "ref": [
              "const",
              "nuie_scalesta_net.cscart_products_categories.product_id"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 4,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "1.20",
              "eval_cost": "0.48",
              "prefix_cost": "54.77",
              "data_read_per_join": "76"
            },
            "used_columns": [
              "product_id",
              "category_id",
              "position"
            ]
          }
        }
      ]
    }
  }
}