SELECT 
  lang.name, 
  lang.value 
FROM 
  cscart_language_values lang 
WHERE 
  lang.lang_code = 'en' 
  AND lang.name IN (
    'my_changes.header.view_all', 'my_changes.header.view_all', 
    'settings', 'settings', 'my_changes.header.locale', 
    'my_changes.header.language', 'my_changes.header.currency', 
    'view_wishlist', 'my_changes.header.locale', 
    'my_changes.header.language', 'my_changes.header.currency', 
    'my_changes.header.view_all', 'my_changes.header.view_all', 
    'settings', 'settings', 'my_changes.header.locale', 
    'my_changes.header.language', 'my_changes.header.currency', 
    'view_wishlist', 'my_changes.header.locale', 
    'my_changes.header.language', 'my_changes.header.currency'
  )

Query time 0.00143

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": 6,
      "filtered": 100,
      "index_condition": "lang.lang_code = 'en' and lang.`name` in ('my_changes.header.view_all','my_changes.header.view_all','settings','settings','my_changes.header.locale','my_changes.header.language','my_changes.header.currency','view_wishlist','my_changes.header.locale','my_changes.header.language','my_changes.header.currency','my_changes.header.view_all','my_changes.header.view_all','settings','settings','my_changes.header.locale','my_changes.header.language','my_changes.header.currency','view_wishlist','my_changes.header.locale','my_changes.header.language','my_changes.header.currency')"
    }
  }
}