Optimise a MYSQL query based on users and usermeta table - mysql

Question

the tables
the query
SELECT
u.ID AS _ctbUserId,
umRef.meta_value AS _ctbRef,
umThumbnail.meta_value AS _ctbThumbnail,
umShortText.meta_value AS _ctbShortText,
umLanguages.meta_value AS _ctbLanguages,
umKeywords.meta_value AS _ctbKeywords,
umNickname.meta_value AS _ctbNickname,
umChatSessionGuid.meta_value AS _ctbChatSessionGuid,
umChatSessionStatus.meta_value AS _ctbChatSessionStatus,
umChatSessionStatusVisual.meta_value AS _ctbChatSessionStatusVisual,
umChatSessionMaxUsers.meta_value AS _ctbChatSessionMaxUsers,
umChatSessionLastChanged.meta_value AS _ctbChatSessionLastChanged,
umChatSessionTpm.meta_value AS _ctbChatSessionTpm,
umChatEnableCam.meta_value AS _ctbChatEnableCam,
umMessenger.meta_value AS _ctbMessenger,
umMessengerTokensPerMessage.meta_value AS _ctbMessengerTokensPerMessage,
umCallSessionStatus.meta_value AS _ctbCallSessionStatus,
umCallSessionStatusVisual.meta_value AS _ctbCallSessionStatusVisual,
umCallSessionStatusLastChanged.meta_value AS _ctbCallSessionLastChanged,
umCallSessionTpm.meta_value AS _ctbCallSessionTpm
FROM chattabai_users AS u
LEFT JOIN chattabai_usermeta AS umRole ON umRole.user_id = u.ID AND umRole.meta_key = "chattabai_capabilities"
LEFT JOIN chattabai_usermeta AS umRef ON umRef.user_id = u.ID AND umRef.meta_key = "_ctbRef"
LEFT JOIN chattabai_usermeta AS umThumbnail ON umThumbnail.user_id = u.ID AND umThumbnail.meta_key = "_ctbThumbnail"
LEFT JOIN chattabai_usermeta AS umShortText ON umShortText.user_id = u.ID AND umShortText.meta_key = "_ctbShortText"
LEFT JOIN chattabai_usermeta AS umLanguages ON umLanguages.user_id = u.ID AND umLanguages.meta_key = "_ctbLanguages"
LEFT JOIN chattabai_usermeta AS umKeywords ON umKeywords.user_id = u.ID AND umKeywords.meta_key = "_ctbKeywords"
LEFT JOIN chattabai_usermeta AS umNickname ON umNickname.user_id = u.ID AND umNickname.meta_key = "_ctbNickname"
LEFT JOIN chattabai_usermeta AS umChatSessionGuid ON umChatSessionGuid.user_id = u.ID AND umChatSessionGuid.meta_key = "_ctbChatSessionGuid"
LEFT JOIN chattabai_usermeta AS umChatSessionStatus ON umChatSessionStatus.user_id = u.ID AND umChatSessionStatus.meta_key = "_ctbChatSessionStatus"
LEFT JOIN chattabai_usermeta AS umChatSessionStatusVisual ON umChatSessionStatusVisual.user_id = u.ID AND umChatSessionStatusVisual.meta_key = "_ctbChatSessionStatusVisual"
LEFT JOIN chattabai_usermeta AS umChatSessionMaxUsers ON umChatSessionMaxUsers.user_id = u.ID AND umChatSessionMaxUsers.meta_key = "_ctbChatSessionMaxUsers"
LEFT JOIN chattabai_usermeta AS umChatSessionLastChanged ON umChatSessionLastChanged.user_id = u.ID AND umChatSessionLastChanged.meta_key = "_ctbChatSessionLastChanged"
LEFT JOIN chattabai_usermeta AS umChatSessionTpm ON umChatSessionTpm.user_id = u.ID AND umChatSessionTpm.meta_key = "_ctbChatSessionTpm"
LEFT JOIN chattabai_usermeta AS umChatEnableCam ON umChatEnableCam.user_id = u.ID AND umChatEnableCam.meta_key = "_ctbChatEnableCam"
LEFT JOIN chattabai_usermeta AS umMessenger ON umMessenger.user_id = u.ID AND umMessenger.meta_key = "_ctbMessenger"
LEFT JOIN chattabai_usermeta AS umMessengerTokensPerMessage ON umMessengerTokensPerMessage.user_id = u.ID AND umMessengerTokensPerMessage.meta_key = "_ctbMessengerTokensPerMessage"
LEFT JOIN chattabai_usermeta AS umCallSessionStatus ON umCallSessionStatus.user_id = u.ID AND umCallSessionStatus.meta_key = "_ctbCallSessionStatus"
LEFT JOIN chattabai_usermeta AS umCallSessionStatusVisual ON umCallSessionStatusVisual.user_id = u.ID AND umCallSessionStatusVisual.meta_key = "_ctbCallSessionStatusVisual"
LEFT JOIN chattabai_usermeta AS umCallSessionStatusLastChanged ON umCallSessionStatusLastChanged.user_id = u.ID AND umCallSessionStatusLastChanged.meta_key = "_ctbCallSessionLastChanged"
LEFT JOIN chattabai_usermeta AS umCallSessionTpm ON umCallSessionTpm.user_id = u.ID AND umCallSessionTpm.meta_key = "_ctbCallSessionTpm"
WHERE umRole.meta_value LIKE 'a: 1: {s: 8:\"employee\";b:1;}'
AND (umChatSessionStatus.meta_value REGEXP 'online|inConversation|pause|offline' OR umCallSessionStatus.meta_value REGEXP 'online|inConversation|pause|offline')
AND umLanguages.meta_value REGEXP ''
AND umKeywords.meta_value REGEXP ''
ORDER BY FIELD(umChatSessionStatus.meta_value, 'online,inConversation,pause,offline'), FIELD(umCallSessionStatus.meta_value, 'online,inConversation,pause,offline')
LIMIT 0, 20
This is from a Wordpress database. As Wordpress uses usermeta data this is the way of storing the user data. ( https://developer.wordpress.org/plugins/users/working-with-user-metadata/ )
This query takes up to 1500MS to run on with a limit of 20 profiles. Any recommendations to improve this?
Output