SELECT 
  lang.name, 
  lang.value 
FROM 
  cscart_language_values lang 
WHERE 
  lang.lang_code = 'en' 
  AND lang.name IN (
    'product_reviews.product_is_rated_n_out_of_five_stars', 
    'product_reviews.show_n_reviews', 
    'product_reviews.show_review', 
    'product_reviews.scroll_to_reviews', 
    'product_reviews.product_is_rated_n_out_of_five_stars', 
    'product_reviews.show_n_reviews', 
    'product_reviews.show_review', 
    'product_reviews.scroll_to_reviews'
  )

Query time 0.00053

JSON explain

{
  "query_block": {
    "select_id": 1,
    "nested_loop": [
      {
        "table": {
          "table_name": "lang",
          "access_type": "range",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
          "key_length": "392",
          "used_key_parts": ["lang_code", "name"],
          "rows": 4,
          "filtered": 100,
          "index_condition": "lang.lang_code = 'en' and lang.`name` in ('product_reviews.product_is_rated_n_out_of_five_stars','product_reviews.show_n_reviews','product_reviews.show_review','product_reviews.scroll_to_reviews','product_reviews.product_is_rated_n_out_of_five_stars','product_reviews.show_n_reviews','product_reviews.show_review','product_reviews.scroll_to_reviews')"
        }
      }
    ]
  }
}