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 (
    88117, 88129, 88263, 89660, 89659, 89661, 
    88343, 88365, 89658, 88296, 88297, 
    88115, 88127, 88139, 88299, 89699, 
    89700, 88342, 89704, 88381, 88382, 
    88104, 88116, 88128, 88262, 88338, 
    88377, 88378, 88114, 88126, 88138, 
    88298, 88334, 88337, 88364, 88374, 
    89657, 88330, 88340, 88341, 88261, 
    88335, 88336, 88379, 88380, 89703, 
    89721, 88333
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00094

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 (88117,88129,88263,89660,89659,89661,88343,88365,89658,88296,88297,88115,88127,88139,88299,89699,89700,88342,89704,88381,88382,88104,88116,88128,88262,88338,88377,88378,88114,88126,88138,88298,88334,88337,88364,88374,89657,88330,88340,88341,88261,88335,88336,88379,88380,89703,89721,88333)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}