SELECT 
  lang.name, 
  IF(
    cscart_ult_language_values.value IS NULL, 
    lang.value, cscart_ult_language_values.value
  ) as value 
FROM 
  cscart_language_values lang 
  LEFT JOIN cscart_ult_language_values ON cscart_ult_language_values.name = lang.name 
  AND company_id = 1 
  AND cscart_ult_language_values.lang_code = lang.lang_code 
WHERE 
  lang.lang_code = 'ja' 
  AND lang.name IN (
    'contact_information', 'text_multiprofile_notice', 
    'billing_address', 'shipping_address', 
    'shipping_address', 'billing_address', 
    'revert', 'delete_my_account_description', 
    'delete_my_account', 'delete_my_account', 
    'delete_my_account', 'usergroup', 
    'status', 'action', 'active', 'available', 
    'join', 'declined', 'join', 'pending', 
    'cancel', 'contact_information', 
    'text_multiprofile_notice', 'billing_address', 
    'shipping_address', 'shipping_address', 
    'billing_address', 'revert', 'delete_my_account_description', 
    'delete_my_account', 'delete_my_account', 
    'delete_my_account', 'usergroup', 
    'status', 'action', 'active', 'available', 
    'join', 'declined', 'join', 'pending', 
    'cancel'
  )

Query time 0.00100

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_ult_language_values",
      "access_type": "system",
      "possible_keys": ["PRIMARY"],
      "rows": 0,
      "filtered": 0,
      "const_row_not_found": true
    },
    "table": {
      "table_name": "lang",
      "access_type": "range",
      "possible_keys": ["PRIMARY"],
      "key": "PRIMARY",
      "key_length": "392",
      "used_key_parts": ["lang_code", "name"],
      "rows": 16,
      "filtered": 100,
      "index_condition": "lang.lang_code = 'ja' and lang.`name` in ('contact_information','text_multiprofile_notice','billing_address','shipping_address','shipping_address','billing_address','revert','delete_my_account_description','delete_my_account','delete_my_account','delete_my_account','usergroup','status','action','active','available','join','declined','join','pending','cancel','contact_information','text_multiprofile_notice','billing_address','shipping_address','shipping_address','billing_address','revert','delete_my_account_description','delete_my_account','delete_my_account','delete_my_account','usergroup','status','action','active','available','join','declined','join','pending','cancel')"
    }
  }
}