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 (
    95067, 95068, 95328, 95329, 95330, 95344, 
    95345, 95346, 95349, 95352, 95358, 
    95359, 95452, 95536, 95537, 95538, 
    95539, 95540, 95541, 95552, 95553, 
    95554, 96177, 96178, 96179, 96180, 
    96191, 96192, 96828, 96829, 96830, 
    96831, 96834, 96835, 96836, 96837, 
    96838, 96887, 96888, 96889, 96890, 
    96891, 96892, 96931, 96932, 96933, 
    96942, 96943
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00105

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "21.62"
    },
    "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": "16.82",
        "eval_cost": "4.80",
        "prefix_cost": "21.62",
        "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 (95067,95068,95328,95329,95330,95344,95345,95346,95349,95352,95358,95359,95452,95536,95537,95538,95539,95540,95541,95552,95553,95554,96177,96178,96179,96180,96191,96192,96828,96829,96830,96831,96834,96835,96836,96837,96838,96887,96888,96889,96890,96891,96892,96931,96932,96933,96942,96943)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}