Sandbox

SELECT 
  lang.name, 
  IF(
    vi_ult_language_values.value IS NULL, 
    lang.value, vi_ult_language_values.value
  ) as value 
FROM 
  vi_language_values lang 
  LEFT JOIN vi_ult_language_values ON vi_ult_language_values.name = lang.name 
  AND company_id = 1 
  AND vi_ult_language_values.lang_code = lang.lang_code 
WHERE 
  lang.lang_code = 'it' 
  AND lang.name IN (
    'social_buttons.facebook_cookie_title', 
    'social_buttons.facebook_cookie_description', 
    'social_buttons.pinterest_cookie_title', 
    'social_buttons.pinterest_cookie_description', 
    'social_buttons.twitter_cookie_title', 
    'social_buttons.twitter_cookie_description', 
    'social_buttons.vkontakte_cookie_title', 
    'social_buttons.vkontakte_cookie_description', 
    'social_buttons.yandex_cookie_title', 
    'social_buttons.yandex_cookie_description', 
    'social_buttons.facebook_cookie_title', 
    'social_buttons.facebook_cookie_description', 
    'social_buttons.pinterest_cookie_title', 
    'social_buttons.pinterest_cookie_description', 
    'social_buttons.twitter_cookie_title', 
    'social_buttons.twitter_cookie_description', 
    'social_buttons.vkontakte_cookie_title', 
    'social_buttons.vkontakte_cookie_description', 
    'social_buttons.yandex_cookie_title', 
    'social_buttons.yandex_cookie_description'
  )

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "nested_loop": [
      {
        "table": {
          "table_name": "vi_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": 10,
          "filtered": 100,
          "index_condition": "lang.lang_code = 'it' and lang.`name` in ('social_buttons.facebook_cookie_title','social_buttons.facebook_cookie_description','social_buttons.pinterest_cookie_title','social_buttons.pinterest_cookie_description','social_buttons.twitter_cookie_title','social_buttons.twitter_cookie_description','social_buttons.vkontakte_cookie_title','social_buttons.vkontakte_cookie_description','social_buttons.yandex_cookie_title','social_buttons.yandex_cookie_description','social_buttons.facebook_cookie_title','social_buttons.facebook_cookie_description','social_buttons.pinterest_cookie_title','social_buttons.pinterest_cookie_description','social_buttons.twitter_cookie_title','social_buttons.twitter_cookie_description','social_buttons.vkontakte_cookie_title','social_buttons.vkontakte_cookie_description','social_buttons.yandex_cookie_title','social_buttons.yandex_cookie_description')"
        }
      }
    ]
  }
}

Result

name	value
social_buttons.facebook_cookie_description	I cookie di Facebook abilitano le funzionalità relative a Facebook, come il pulsante Facebook sulla pagina del prodotto. Ecco <a href="https://www.facebook.com/about/privacy/previous" target="_blank">Informativa sulla privacy di Facebook</a>.
social_buttons.facebook_cookie_title	Facebook
social_buttons.pinterest_cookie_description	I cookie di Pinterest abilitano le funzionalità relative a Pinterest, come il pulsante Pinterest nella pagina del prodotto. Ecco <a href="https://policy.pinterest.com/en/privacy-policy" target="_blank">Informativa sulla privacy di Pinterest</a>.
social_buttons.pinterest_cookie_title	Pinterest
social_buttons.twitter_cookie_description	I cookie di Twitter abilitano le funzionalità relative a Twitter, come il pulsante Twitter nella pagina del prodotto. Ecco <a href="https://twitter.com/en/privacy" target="_blank">Informativa sulla privacy di Twitter</a>.
social_buttons.twitter_cookie_title	Twitter
social_buttons.vkontakte_cookie_description	I cookie VK abilitano funzionalità relative a VK, come il pulsante VK nella pagina del prodotto. Ecco <a href="https://m.vk.com/privacy" target="_blank">informativa sulla privacy di VK</a>.
social_buttons.vkontakte_cookie_title	VK
social_buttons.yandex_cookie_description	Yandex ci aiuta a visualizzare i pulsanti di più social network (ad esempio, sulle pagine dei prodotti). Ecco <a href="https://yandex.com/legal/confidential/" target="_blank">Informativa sulla privacy di Yandex</a>.
social_buttons.yandex_cookie_title	Yandex