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 (
    93532, 93819, 93820, 93821, 93822, 93823, 
    93824, 93831, 93846, 93847, 93855, 
    93856, 93857, 93858, 93878, 93879, 
    93880, 93881, 94161, 94162, 94163, 
    94164, 94435, 94442, 94443, 94444, 
    94445, 94446, 94592, 94593, 94594, 
    94650, 94662, 94814, 94815, 94837, 
    95443, 95444, 95445, 95446, 95447, 
    95791, 95792, 95793, 95794, 95795, 
    95796, 95797
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00048

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 (93532,93819,93820,93821,93822,93823,93824,93831,93846,93847,93855,93856,93857,93858,93878,93879,93880,93881,94161,94162,94163,94164,94435,94442,94443,94444,94445,94446,94592,94593,94594,94650,94662,94814,94815,94837,95443,95444,95445,95446,95447,95791,95792,95793,95794,95795,95796,95797)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}