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 (
    96932, 96933, 96934, 96935, 96936, 96937, 
    96938, 96939, 96940, 96941, 96942, 
    96943, 96944, 96945, 96946, 96947, 
    96948, 96949, 96950, 96951, 96952, 
    96953, 96954, 96955, 96956, 96957, 
    96958, 96959, 96960, 96961, 96962, 
    96963, 96964, 96965, 96966, 96967, 
    96968, 96969, 96970, 96971, 96972, 
    96973, 96974, 96975, 96976, 96977, 
    96978, 96979, 96980, 98509, 98510, 
    98511, 98512, 98513, 98514, 98516, 
    98517, 98518, 98519, 98520, 98889, 
    98890, 98891, 98892, 98893, 98894, 
    98895, 98896, 98898, 98899, 98900, 
    98901, 98902, 98903, 98904, 98905, 
    98906, 98907, 98908, 98909, 100181, 
    100182, 100183, 100184, 100185, 100186, 
    100187, 100188, 100189, 100190, 100191, 
    100192, 100193, 100194, 100195, 100196
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00152

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 (96932,96933,96934,96935,96936,96937,96938,96939,96940,96941,96942,96943,96944,96945,96946,96947,96948,96949,96950,96951,96952,96953,96954,96955,96956,96957,96958,96959,96960,96961,96962,96963,96964,96965,96966,96967,96968,96969,96970,96971,96972,96973,96974,96975,96976,96977,96978,96979,96980,98509,98510,98511,98512,98513,98514,98516,98517,98518,98519,98520,98889,98890,98891,98892,98893,98894,98895,98896,98898,98899,98900,98901,98902,98903,98904,98905,98906,98907,98908,98909,100181,100182,100183,100184,100185,100186,100187,100188,100189,100190,100191,100192,100193,100194,100195,100196)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}