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 (
    88064, 88568, 88957, 88958, 88986, 88168, 
    88216, 89842, 89894, 89967, 91533, 
    84770, 84783, 84792, 87538, 88418, 
    89787, 89791, 88754, 88942, 85664, 
    85684, 85696, 85708, 85669, 85689, 
    85701, 85713, 88969, 88970, 88973, 
    88974, 85730, 85747, 85757, 85767, 
    84765, 85660, 85677, 88554, 88660, 
    88661, 88707, 88708, 85721, 85738, 
    85748, 85758
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00104

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 (88064,88568,88957,88958,88986,88168,88216,89842,89894,89967,91533,84770,84783,84792,87538,88418,89787,89791,88754,88942,85664,85684,85696,85708,85669,85689,85701,85713,88969,88970,88973,88974,85730,85747,85757,85767,84765,85660,85677,88554,88660,88661,88707,88708,85721,85738,85748,85758)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}