MySQL 5.1 using filesort event when an index is present?

Since your CREATE TABLE statement indicates that you have less than 10 rows ( AUTO_INCREMENT=7 ) and using FORCE INDEX on my installation will make MySQL use the index, I'm guessing the optimizer thinks a table scan is faster (less random I/O) than an index scan (since you're selecting all columns, not just date_created ). This is confirmed by the following.

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