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 (
    91727, 91728, 91729, 91730, 91731, 91732, 
    91733, 91734, 91755, 91756, 91757, 
    91758, 91759, 91760, 91761, 91762, 
    91763, 91812, 91813, 91814, 91815, 
    84942, 84934, 92167, 84737, 84739, 
    84725, 87980, 87983, 84715, 84741, 
    92161, 92162, 92163, 87984, 87970, 
    92164, 92165, 92166, 84714, 84713, 
    88023, 84947, 88032, 84848, 87985, 
    84912, 84736, 84688, 84712, 87979, 
    84960, 87976, 87978, 84850, 84743, 
    84849, 84951, 84747, 84761, 84711, 
    84710, 84911, 84717, 87969, 87967, 
    88038, 84846, 84910, 87981, 87982, 
    85274, 84687, 84709, 87977, 87918, 
    87919, 87920, 87924, 87926, 87930, 
    87931, 87932, 88027, 88089, 84940, 
    84941, 88024, 87898, 87899, 87902, 
    87968, 84728, 84729, 84730, 88022
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00214

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 (91727,91728,91729,91730,91731,91732,91733,91734,91755,91756,91757,91758,91759,91760,91761,91762,91763,91812,91813,91814,91815,84942,84934,92167,84737,84739,84725,87980,87983,84715,84741,92161,92162,92163,87984,87970,92164,92165,92166,84714,84713,88023,84947,88032,84848,87985,84912,84736,84688,84712,87979,84960,87976,87978,84850,84743,84849,84951,84747,84761,84711,84710,84911,84717,87969,87967,88038,84846,84910,87981,87982,85274,84687,84709,87977,87918,87919,87920,87924,87926,87930,87931,87932,88027,88089,84940,84941,88024,87898,87899,87902,87968,84728,84729,84730,88022)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}