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 (
    92255, 92256, 92257, 92496, 92497, 92498, 
    92499, 92254, 92489, 92490, 92491, 
    92492, 92493, 92494, 92495, 92240, 
    92245, 92247, 92248, 92249, 92250, 
    92252, 92253, 92485, 92486, 92487, 
    92241, 92242, 92243, 92244, 92246, 
    92251, 92483, 92484, 92488, 92476, 
    92477, 92478, 92479, 92480, 92481, 
    92482, 85554, 85570, 85543, 92239, 
    85591, 85597
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00089

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 (92255,92256,92257,92496,92497,92498,92499,92254,92489,92490,92491,92492,92493,92494,92495,92240,92245,92247,92248,92249,92250,92252,92253,92485,92486,92487,92241,92242,92243,92244,92246,92251,92483,92484,92488,92476,92477,92478,92479,92480,92481,92482,85554,85570,85543,92239,85591,85597)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}