Mysql - Unterschiedlich sortierte Ergebnisse aus gleichen Tabelle mit Union verbinden

Hallo, ich habe eine Personen-Tabelle. Ich möchte, dass die erste drei Ergebnisse immer aus aktuellsten weiblichen Personen kommen und Rest gemischt nach Aktualität.

So kriege ich es hin. Aber es ist etwas langsam.

(SELECT a FROM Personen WHERE gender='f' ORDER BY last_login desc LIMIT 3)
UNION
(SELECT a FROM Personen ORDER BY last_login desc LIMIT 7);

MySQL

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