SELECT 
  lang.name, 
  lang.value 
FROM 
  cscart_language_values lang 
WHERE 
  lang.lang_code = 'fr' 
  AND lang.name IN (
    'text_out_of_stock', 'sku', 'select_options', 
    'add_to_cart_short', 'old_price', 
    'old_price', 'list_price', 'list_price', 
    'list_price', 'list_price', 'enter_your_price', 
    'contact_us_for_price', 'sign_in_to_view_price', 
    'inc_tax', 'including_tax', 'inc_tax', 
    'including_tax', 'you_save', 'you_save', 
    'save_discount', 'free_shipping', 
    'save_discount', 'save_discount', 
    'availability', 'items', 'on_backorder', 
    'in_stock', 'availability', 'in_stock', 
    'on_backorder', 'availability', 
    'quantity', 'text_cart_min_qty', 
    'text_edp_product', 'text_out_of_stock', 
    'sku', 'select_options', 'add_to_cart_short', 
    'old_price', 'old_price', 'list_price', 
    'list_price', 'list_price', 'list_price', 
    'enter_your_price', 'contact_us_for_price', 
    'sign_in_to_view_price', 'inc_tax', 
    'including_tax', 'inc_tax', 'including_tax', 
    'you_save', 'you_save', 'save_discount', 
    'free_shipping', 'save_discount', 
    'save_discount', 'availability', 
    'items', 'on_backorder', 'in_stock', 
    'availability', 'in_stock', 'on_backorder', 
    'availability', 'quantity', 'text_cart_min_qty', 
    'text_edp_product'
  )

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "lang",
      "access_type": "range",
      "possible_keys": ["PRIMARY"],
      "key": "PRIMARY",
      "key_length": "392",
      "used_key_parts": ["lang_code", "name"],
      "rows": 21,
      "filtered": 100,
      "attached_condition": "lang.lang_code = 'fr' and lang.`name` in ('text_out_of_stock','sku','select_options','add_to_cart_short','old_price','old_price','list_price','list_price','list_price','list_price','enter_your_price','contact_us_for_price','sign_in_to_view_price','inc_tax','including_tax','inc_tax','including_tax','you_save','you_save','save_discount','free_shipping','save_discount','save_discount','availability','items','on_backorder','in_stock','availability','in_stock','on_backorder','availability','quantity','text_cart_min_qty','text_edp_product','text_out_of_stock','sku','select_options','add_to_cart_short','old_price','old_price','list_price','list_price','list_price','list_price','enter_your_price','contact_us_for_price','sign_in_to_view_price','inc_tax','including_tax','inc_tax','including_tax','you_save','you_save','save_discount','free_shipping','save_discount','save_discount','availability','items','on_backorder','in_stock','availability','in_stock','on_backorder','availability','quantity','text_cart_min_qty','text_edp_product')"
    }
  }
}