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 = 7148 
WHERE 
  cscart_products_categories.product_id IN (
    98955, 98956, 98957, 98958, 98959, 98960, 
    98961, 98962, 98963, 98964, 98965, 
    98966, 98967, 98968, 98969, 98970, 
    98971, 98972, 98973, 98974, 98975, 
    98976, 98977, 98978, 98979, 98980, 
    98981, 98982, 98983, 98984, 98985, 
    98986, 98987, 98988, 98989, 98990, 
    98991, 98992, 98993, 98994, 98995, 
    98996, 98997, 98998, 98999, 99000, 
    99001, 99002, 99003, 99004, 99005, 
    99006, 99007, 99008, 99009, 99010, 
    99011, 99056, 99057, 99058, 99059, 
    99060, 99061, 99062, 99063, 99064, 
    99065, 99066, 99067, 99133, 99141, 
    99142, 99151, 99152, 99169, 99170, 
    99248, 99257, 99262, 99322, 99323, 
    99324, 99325, 99326, 99327, 99328, 
    99329, 99333, 99334, 99335, 99336, 
    99337, 99338, 99339, 99340, 99341
  ) 
GROUP BY 
  cscart_products_categories.product_id

Query time 0.00262

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "85.44"
    },
    "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": 150,
            "rows_produced_per_join": 150,
            "filtered": "100.00",
            "using_index": true,
            "cost_info": {
              "read_cost": "15.31",
              "eval_cost": "15.00",
              "prefix_cost": "30.31",
              "data_read_per_join": "2K"
            },
            "used_columns": [
              "product_id",
              "category_id",
              "link_type"
            ],
            "attached_condition": "(`nuie_scalesta_net`.`cscart_products_categories`.`product_id` in (98955,98956,98957,98958,98959,98960,98961,98962,98963,98964,98965,98966,98967,98968,98969,98970,98971,98972,98973,98974,98975,98976,98977,98978,98979,98980,98981,98982,98983,98984,98985,98986,98987,98988,98989,98990,98991,98992,98993,98994,98995,98996,98997,98998,98999,99000,99001,99002,99003,99004,99005,99006,99007,99008,99009,99010,99011,99056,99057,99058,99059,99060,99061,99062,99063,99064,99065,99066,99067,99133,99141,99142,99151,99152,99169,99170,99248,99257,99262,99322,99323,99324,99325,99326,99327,99328,99329,99333,99334,99335,99336,99337,99338,99339,99340,99341))"
          }
        },
        {
          "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": 7,
            "filtered": "5.00",
            "cost_info": {
              "read_cost": "37.50",
              "eval_cost": "0.75",
              "prefix_cost": "82.81",
              "data_read_per_join": "19K"
            },
            "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": 7,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "1.88",
              "eval_cost": "0.75",
              "prefix_cost": "85.44",
              "data_read_per_join": "120"
            },
            "used_columns": [
              "product_id",
              "category_id",
              "position"
            ]
          }
        }
      ]
    }
  }
}