That's created by the threadviews cron process (includes/cron/threadviews.php) that runs once an hour to update the thread view counts (if you have that option selected in the acp). It's supposed to be dropped when the process is done with it. I don't really know much about mysql admin, but if it's been there for a while (like more than an hour) then I don't see why you couldn't drop it.
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