SELECT 
  cscart_product_descriptions.product_id, 
  cscart_product_descriptions.meta_keywords, 
  cscart_product_descriptions.meta_description, 
  cscart_product_descriptions.search_words, 
  cscart_product_descriptions.promo_text, 
  cscart_product_descriptions.unit_name 
FROM 
  cscart_product_descriptions 
WHERE 
  cscart_product_descriptions.product_id IN (
    95, 101, 103, 92, 86, 87, 85, 89, 91, 90, 
    97, 98, 99, 100, 104, 105
  ) 
  AND cscart_product_descriptions.lang_code = 'fr'

Query time 0.00096

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_product_descriptions",
      "access_type": "range",
      "possible_keys": ["PRIMARY", "product_id"],
      "key": "product_id",
      "key_length": "3",
      "used_key_parts": ["product_id"],
      "rows": 16,
      "filtered": 100,
      "index_condition": "cscart_product_descriptions.product_id in (95,101,103,92,86,87,85,89,91,90,97,98,99,100,104,105)",
      "attached_condition": "cscart_product_descriptions.lang_code = 'fr'"
    }
  }
}