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SELECT 
  vi_product_descriptions.product_id, 
  vi_product_descriptions.short_description, 
  IF(
    vi_product_descriptions.short_description = '' 
    OR vi_product_descriptions.short_description IS NULL, 
    vi_product_descriptions.full_description, 
    ''
  ) AS full_description, 
  vi_product_descriptions.meta_keywords, 
  vi_product_descriptions.meta_description, 
  vi_product_descriptions.search_words, 
  vi_product_descriptions.promo_text, 
  vi_product_descriptions.unit_name 
FROM 
  vi_product_descriptions 
WHERE 
  vi_product_descriptions.product_id IN (8, 9, 10) 
  AND vi_product_descriptions.lang_code = 'en'

Query time 0.00012

JSON explain

{
  "query_block": {
    "select_id": 1,
    "nested_loop": [
      {
        "table": {
          "table_name": "vi_product_descriptions",
          "access_type": "range",
          "possible_keys": ["PRIMARY", "product_id"],
          "key": "PRIMARY",
          "key_length": "9",
          "used_key_parts": ["product_id", "lang_code"],
          "rows": 3,
          "filtered": 100,
          "index_condition": "vi_product_descriptions.product_id in (8,9,10) and vi_product_descriptions.lang_code = 'en'"
        }
      }
    ]
  }
}

Result

product_id	full_description	promo_text
8	<p> Although its attractive features, design, and passive 3D have merit, the picture quality issues of the Toshiba TL515U LED-based LCD TV lessen its appeal in the face of the stiff competition. </p>	<p class="product-promo-text"><span class="product-promo-header">FREE US shipping over $100!</span><span class="product-promo-body">Orders within next 2 days will be shipped on Monday</span></p>
9	<p>Although its attractive features, design, and passive 3D have merit, the picture quality issues of the Toshiba TL515U LED-based LCD TV lessen its appeal in the face of the stiff competition.</p>	<p class="product-promo-text"><span class="product-promo-header">FREE US shipping over $100!</span><span class="product-promo-body">Orders within next 2 days will be shipped on Monday</span></p>
10	<p>Although its attractive features, design, and passive 3D have merit, the picture quality issues of the Toshiba TL515U LED-based LCD TV lessen its appeal in the face of the stiff competition.</p>	<p class="product-promo-text"><span class="product-promo-header">FREE US shipping over $100!</span><span class="product-promo-body">Orders within next 2 days will be shipped on Monday</span></p>