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, 
  cscart_product_descriptions.unit_name 
FROM 
  cscart_product_descriptions 
WHERE 
  cscart_product_descriptions.product_id IN (7784, 7782, 7783, 7785) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00046

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "2.84"
    },
    "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": 4,
      "rows_produced_per_join": 4,
      "filtered": "100.00",
      "index_condition": "((`softwarepirmam_hewadelivard_cscart_4`.`cscart_product_descriptions`.`product_id` in (7784,7782,7783,7785)) and (`softwarepirmam_hewadelivard_cscart_4`.`cscart_product_descriptions`.`lang_code` = 'en'))",
      "cost_info": {
        "read_cost": "2.44",
        "eval_cost": "0.40",
        "prefix_cost": "2.84",
        "data_read_per_join": "18K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "short_description",
        "full_description",
        "unit_name"
      ]
    }
  }
}

Result

product_id short_description full_description unit_name
7782 <p><strong></strong><strong>Mont Blanc Signature Absolue</strong> This radiant and intense fragrance unfolds with a fresh, fruity-spicy opening of pear, mandarin and pink pepper, flowing into a luminous floral heart of ylang-ylang, frangipani and tuberose, and resting on a warm, elegant base of tonka bean, cedarwood and golden amber.</p>
7783 <p><strong> Mont Blanc Presence d'une Femme EDT</strong> is an elegant oriental-floral fragrance for women that opens with a fresh blend of mandarin and pepper. The heart reveals delicate orchid and cyclamen, adding a soft feminine touch, while the base unfolds into warm notes of Brazilian rosewood, mahogany, sandalwood, patchouli, and vanilla, creating a sensual and sophisticated trail.</p>
7784 <p><strong>Mont Blanc Individuelle Femme EDT</strong> is an oriental-floral fragrance for women, introduced in 2004. It opens with a vibrant blend of pink pepper, red currant and bay leaf, transitions into a floral heart of rose and lotus, and settles into a warm, sensual base of patchouli, vanilla, amber and musk.</p>
7785 <p><strong>Mont Blanc Emblem Lady EDP</strong> is a refined and charismatic fragrance for women, where vibrant fruity-floral top notes of sake, pink pepper and pink grapefruit open the scene. These transition into a rich heart of jasmine and pomegranate, and soft into a sophisticated base of sandalwood, amber and musk crystals, creating an elegant woody-fruity signature.</p>