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 (
    89844, 89845, 89916, 89917, 91483, 91484, 
    85283, 85284, 85380, 85381, 85431, 
    85432, 85482, 85483, 82712, 83301, 
    84496, 84562, 89749, 85281, 85378, 
    85429, 85480, 86466, 86742, 90013, 
    82713, 83302, 85278, 85279, 89750, 
    85282, 85379, 85430, 85481, 85276, 
    82583, 83018, 83019, 83570, 83572, 
    84515, 84581, 85050, 85136, 85182, 
    85228, 90852, 90854, 90931, 90933, 
    91092, 91093, 91178, 91179, 91233, 
    91234, 83016, 83567, 90849, 90928, 
    89742, 89743, 85277, 85048, 85049, 
    85134, 85135, 85180, 85181, 85226, 
    85227, 85044, 83017, 83568, 90850, 
    90929, 91069, 86463, 86464, 86739, 
    86740, 89740, 89741, 86605, 86606, 
    86674, 86675, 83458, 85042, 85043, 
    86603, 86672, 85280, 85377, 85428
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00252

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 (89844,89845,89916,89917,91483,91484,85283,85284,85380,85381,85431,85432,85482,85483,82712,83301,84496,84562,89749,85281,85378,85429,85480,86466,86742,90013,82713,83302,85278,85279,89750,85282,85379,85430,85481,85276,82583,83018,83019,83570,83572,84515,84581,85050,85136,85182,85228,90852,90854,90931,90933,91092,91093,91178,91179,91233,91234,83016,83567,90849,90928,89742,89743,85277,85048,85049,85134,85135,85180,85181,85226,85227,85044,83017,83568,90850,90929,91069,86463,86464,86739,86740,89740,89741,86605,86606,86674,86675,83458,85042,85043,86603,86672,85280,85377,85428)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}