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 = 7228 
WHERE 
  cscart_products_categories.product_id IN (
    99014, 99015, 99016, 99017, 99018, 99019, 
    99588, 99589, 99590, 99591, 99592, 
    99593, 99594, 99595, 99596, 99597, 
    99598, 99599, 99600, 99601, 99602, 
    99603, 99604, 99605, 99606, 99607, 
    99608, 99609, 99610, 99611, 99612, 
    99613, 99614, 99615, 99616, 99617, 
    99618, 99619, 99620, 99621, 99622, 
    99623, 99624, 99625, 99626, 99627, 
    99628, 99629, 99630, 99631, 99632, 
    99633, 99634, 99635, 99636, 99637, 
    99638, 99639, 99640, 99641, 99642, 
    99643, 99644, 99645, 99646, 99647, 
    99669, 99670, 99671, 99672, 99673, 
    99674, 99675, 99676, 99677, 99678, 
    99679, 99680, 99681, 99682, 99683, 
    99684, 99685, 99686, 99687, 99688, 
    99689, 99690, 99691, 99692, 99693, 
    99694, 99695, 99696, 99697, 99698
  ) 
GROUP BY 
  cscart_products_categories.product_id

Query time 0.01699

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "86.69"
    },
    "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 (99014,99015,99016,99017,99018,99019,99588,99589,99590,99591,99592,99593,99594,99595,99596,99597,99598,99599,99600,99601,99602,99603,99604,99605,99606,99607,99608,99609,99610,99611,99612,99613,99614,99615,99616,99617,99618,99619,99620,99621,99622,99623,99624,99625,99626,99627,99628,99629,99630,99631,99632,99633,99634,99635,99636,99637,99638,99639,99640,99641,99642,99643,99644,99645,99646,99647,99669,99670,99671,99672,99673,99674,99675,99676,99677,99678,99679,99680,99681,99682,99683,99684,99685,99686,99687,99688,99689,99690,99691,99692,99693,99694,99695,99696,99697,99698))"
          }
        },
        {
          "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": 96,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "24.00",
              "eval_cost": "9.60",
              "prefix_cost": "53.09",
              "data_read_per_join": "1K"
            },
            "used_columns": [
              "product_id",
              "category_id",
              "position"
            ]
          }
        },
        {
          "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": "86.69",
              "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')))"
          }
        }
      ]
    }
  }
}