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 (
    94891, 94892, 94894, 94895, 94898, 94903, 
    94904, 94905, 94908, 94909, 94910, 
    94911, 94912, 94913, 94914, 94915, 
    94918, 94921, 94922, 94923, 94924, 
    94925, 94926, 94927, 94928, 94929, 
    94930, 94931, 94932, 94933, 94934, 
    94935, 94936, 94937, 94938, 94941, 
    94943, 94944, 94947, 96247, 96248, 
    96249, 96252, 96253, 96254, 96255, 
    96256, 96257
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00109

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 (94891,94892,94894,94895,94898,94903,94904,94905,94908,94909,94910,94911,94912,94913,94914,94915,94918,94921,94922,94923,94924,94925,94926,94927,94928,94929,94930,94931,94932,94933,94934,94935,94936,94937,94938,94941,94943,94944,94947,96247,96248,96249,96252,96253,96254,96255,96256,96257)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}