SELECT 
  cscart_product_descriptions.product_id, 
  cscart_product_descriptions.short_description, 
  IF(
    cscart_product_descriptions.short_description = '' 
    OR cscart_product_descriptions.short_description IS NULL, 
    cscart_product_descriptions.full_description, 
    ''
  ) AS full_description 
FROM 
  cscart_product_descriptions 
WHERE 
  cscart_product_descriptions.product_id IN (
    91125, 91127, 91129, 91200, 91202, 91206, 
    91208, 91211, 91213, 91215, 91255, 
    91257, 91261, 91263, 91266, 91268, 
    91270, 85352, 85354, 91145, 91147, 
    91151, 91153, 91156, 91158, 91160, 
    82811, 82813, 82884, 82886, 82957, 
    82959, 83331, 83333, 83341, 83343, 
    89493, 89494, 89501, 89502, 89509, 
    89510, 89517, 89518, 82592, 82594, 
    83355, 83357, 86630, 86632, 86699, 
    86701, 82822, 82824, 82895, 82897, 
    82968, 82970, 86190, 86191, 86213, 
    86214, 86522, 86523, 86798, 86799, 
    86188, 86211, 86520, 86796, 82603, 
    82605, 83071, 83072, 83624, 83625, 
    90907, 90908, 90986, 90987, 85082, 
    85168, 85214, 85260, 85122, 86189, 
    86212, 86521, 86797, 89073, 83069, 
    83622, 90905, 90984, 85080, 85166
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00071

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "43.24"
    },
    "table": {
      "table_name": "cscart_product_descriptions",
      "access_type": "range",
      "possible_keys": [
        "PRIMARY",
        "product_id"
      ],
      "key": "PRIMARY",
      "used_key_parts": [
        "product_id",
        "lang_code"
      ],
      "key_length": "9",
      "rows_examined_per_scan": 96,
      "rows_produced_per_join": 96,
      "filtered": "100.00",
      "cost_info": {
        "read_cost": "33.64",
        "eval_cost": "9.60",
        "prefix_cost": "43.24",
        "data_read_per_join": "366K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "short_description",
        "full_description"
      ],
      "attached_condition": "((`nuie_scalesta_net`.`cscart_product_descriptions`.`product_id` in (91125,91127,91129,91200,91202,91206,91208,91211,91213,91215,91255,91257,91261,91263,91266,91268,91270,85352,85354,91145,91147,91151,91153,91156,91158,91160,82811,82813,82884,82886,82957,82959,83331,83333,83341,83343,89493,89494,89501,89502,89509,89510,89517,89518,82592,82594,83355,83357,86630,86632,86699,86701,82822,82824,82895,82897,82968,82970,86190,86191,86213,86214,86522,86523,86798,86799,86188,86211,86520,86796,82603,82605,83071,83072,83624,83625,90907,90908,90986,90987,85082,85168,85214,85260,85122,86189,86212,86521,86797,89073,83069,83622,90905,90984,85080,85166)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}