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 (
    91895, 92337, 92338, 92339, 92340, 91839, 
    92450, 92451, 92452, 92453, 92454, 
    92455, 92456, 91838, 91837, 92500, 
    85039, 87370, 89609, 89610, 92198, 
    92199, 92200, 92201, 92202, 92444, 
    92445, 92446, 92447, 92146, 92203, 
    92449, 86857, 85037, 91870, 91869, 
    91871, 91872, 91873, 91874, 91875, 
    85038, 92458, 92459, 92460, 92461, 
    92462, 92463
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00097

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 (91895,92337,92338,92339,92340,91839,92450,92451,92452,92453,92454,92455,92456,91838,91837,92500,85039,87370,89609,89610,92198,92199,92200,92201,92202,92444,92445,92446,92447,92146,92203,92449,86857,85037,91870,91869,91871,91872,91873,91874,91875,85038,92458,92459,92460,92461,92462,92463)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}