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 (
    87654, 87655, 87668, 87669, 87675, 87676, 
    87682, 87683, 87703, 87704, 87713, 
    87715, 87727, 87729, 88692, 88693, 
    88739, 88740, 92186, 92187, 92188, 
    92189, 92190, 92441, 85642, 85582, 
    86901, 90023, 90039, 90055, 91840, 
    91841, 91842, 91843, 91845, 91846, 
    91847, 87581, 87596, 87611, 88150, 
    88152, 88792, 86891, 87657, 87671, 
    87678, 87685
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00122

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "21.63"
    },
    "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": 48,
      "rows_produced_per_join": 48,
      "filtered": "100.00",
      "cost_info": {
        "read_cost": "16.83",
        "eval_cost": "4.80",
        "prefix_cost": "21.63",
        "data_read_per_join": "183K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "short_description",
        "full_description"
      ],
      "attached_condition": "((`nuie_scalesta_net`.`cscart_product_descriptions`.`product_id` in (87654,87655,87668,87669,87675,87676,87682,87683,87703,87704,87713,87715,87727,87729,88692,88693,88739,88740,92186,92187,92188,92189,92190,92441,85642,85582,86901,90023,90039,90055,91840,91841,91842,91843,91845,91846,91847,87581,87596,87611,88150,88152,88792,86891,87657,87671,87678,87685)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}