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 (
    94450, 94504, 94796, 94797, 94802, 94803, 
    94804, 94805, 94806, 94807, 94808, 
    94809, 94810, 94825, 94826, 94832, 
    94842, 95312, 95313, 95555, 95556, 
    95737, 95738, 95739, 95740, 95741, 
    95742, 95753, 95754, 95755, 95765, 
    95786, 95787, 95788, 95819, 95820, 
    95885, 95886, 95887, 95888, 96117, 
    96118, 96176, 96529, 96569, 97628, 
    98036, 98037
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00095

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 (94450,94504,94796,94797,94802,94803,94804,94805,94806,94807,94808,94809,94810,94825,94826,94832,94842,95312,95313,95555,95556,95737,95738,95739,95740,95741,95742,95753,95754,95755,95765,95786,95787,95788,95819,95820,95885,95886,95887,95888,96117,96118,96176,96529,96569,97628,98036,98037)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}