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 (
    93536, 93537, 93538, 93539, 93540, 93541, 
    93542, 93543, 93544, 93545, 93546, 
    93547, 93548, 93549, 93550, 93551, 
    93552, 93553, 93554, 93555, 93556, 
    93557, 93558, 93559, 93560, 93561, 
    93562, 93563, 93564, 93565, 93566, 
    93567, 93568, 93569, 93570, 93571, 
    93572, 93573, 93574, 93575, 93576, 
    93577, 93578, 93579, 93580, 93581, 
    93582, 93583
  ) 
  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 (93536,93537,93538,93539,93540,93541,93542,93543,93544,93545,93546,93547,93548,93549,93550,93551,93552,93553,93554,93555,93556,93557,93558,93559,93560,93561,93562,93563,93564,93565,93566,93567,93568,93569,93570,93571,93572,93573,93574,93575,93576,93577,93578,93579,93580,93581,93582,93583)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}