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 = 'en' 
  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 0.00062

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE cscart_ult_language_values system PRIMARY 0 const row not found
1 SIMPLE lang range PRIMARY PRIMARY 392 10 Using index condition

Result

name value
social_buttons.facebook_cookie_description Facebook cookies enable Facebook-related functionality, such as Facebook button on the product page. Here is <a href="https://www.facebook.com/about/privacy/previous" target="_blank">Facebook privacy policy</a>.
social_buttons.facebook_cookie_title Facebook
social_buttons.pinterest_cookie_description Pinterest cookies enable Pinterest-related functionality, such as Pinterest button on the product page. Here is <a href="https://policy.pinterest.com/en/privacy-policy" target="_blank">Pinterest privacy policy</a>.
social_buttons.pinterest_cookie_title Pinterest
social_buttons.twitter_cookie_description Twitter cookies enable Twitter-related functionality, such as the Twitter button on the product page. Here is <a href="https://twitter.com/en/privacy" target="_blank">Twitter privacy policy</a>.
social_buttons.twitter_cookie_title Twitter
social_buttons.vkontakte_cookie_description VK cookies enable VK-related functionality, such as VK button on the product page. Here is <a href="https://m.vk.com/privacy" target="_blank">VK privacy policy</a>.
social_buttons.vkontakte_cookie_title VK
social_buttons.yandex_cookie_description Yandex helps us display the buttons of multiple social networks (for example, on product pages). Here is <a href="https://yandex.com/legal/confidential/" target="_blank">Yandex privacy policy</a>.
social_buttons.yandex_cookie_title Yandex