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 (
    87706, 87719, 87733, 88696, 88743, 91868, 
    91849, 91850, 91851, 91852, 91853, 
    91854, 91855, 91857, 91858, 91859, 
    91860, 91861, 91862, 91863, 92227, 
    82402, 88146, 88589, 92210, 85577, 
    92373, 84244, 84243, 88585, 92383, 
    92384, 92385, 92386, 92387, 92388, 
    92389, 84242, 88584, 91889, 91890, 
    91891, 92333, 92334, 92335, 92336, 
    86888, 92365
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00091

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 (87706,87719,87733,88696,88743,91868,91849,91850,91851,91852,91853,91854,91855,91857,91858,91859,91860,91861,91862,91863,92227,82402,88146,88589,92210,85577,92373,84244,84243,88585,92383,92384,92385,92386,92387,92388,92389,84242,88584,91889,91890,91891,92333,92334,92335,92336,86888,92365)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}