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 (
    92556, 92557, 86235, 86238, 86229, 89593, 
    89594, 91938, 86231, 91937, 91939, 
    91940, 91941, 91942, 91943, 86856, 
    86228, 86223, 89004, 91961, 91962, 
    91963, 91964, 91965, 91966, 91967, 
    86227, 82403, 82410, 82424, 89591, 
    89592, 86226, 86237, 86230, 91993, 
    91994, 91995, 91996, 91997, 91998, 
    91999, 82362, 91960, 82360, 91953, 
    91954, 91955, 91956, 91957, 91958, 
    91959, 84290, 82404, 82342, 82367, 
    86236, 86222, 82338, 82337, 82406, 
    82412, 82426, 86224, 91978, 91981, 
    82563, 82567, 82571, 82333, 86225, 
    91977, 91979, 91980, 91982, 91983, 
    82556, 85583, 89595, 89596, 89597, 
    82335, 82336, 82401, 82409, 82419, 
    82405, 82411, 82425, 91992, 91936, 
    91970, 91973, 86234, 82374, 91985
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00257

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 (92556,92557,86235,86238,86229,89593,89594,91938,86231,91937,91939,91940,91941,91942,91943,86856,86228,86223,89004,91961,91962,91963,91964,91965,91966,91967,86227,82403,82410,82424,89591,89592,86226,86237,86230,91993,91994,91995,91996,91997,91998,91999,82362,91960,82360,91953,91954,91955,91956,91957,91958,91959,84290,82404,82342,82367,86236,86222,82338,82337,82406,82412,82426,86224,91978,91981,82563,82567,82571,82333,86225,91977,91979,91980,91982,91983,82556,85583,89595,89596,89597,82335,82336,82401,82409,82419,82405,82411,82425,91992,91936,91970,91973,86234,82374,91985)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}