Only call check_for_timeout on messages that are likely timedout

This prevents us from bringing back every message in dequeue in the
region to just check its timeout values when we could do the check
in sql

app/models/miq_queue.rb

@@ -546,7 +546,7 @@ def check_for_timeout(log_prefix = "MIQ(MiqQueue.check_for_timeout)", grace = 10
   end
 
   def self.check_for_timeout
-    where(:state => STATE_DEQUEUE).find_each(&:check_for_timeout)
+    where(:state => STATE_DEQUEUE).where("(select date_part('epoch', updated_on) + msg_timeout) < ?", Time.now.to_i).each(&:check_for_timeout)
   end
 
   def finished?