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Re: MyISAM using 'wrong' index
Posted by: Rick James
Date: July 04, 2015 11:10AM

The statistics are _usually_ kept up to date without any explicit OPTIMIZE (etc).

"normally I do select data from the joined table" -- since anything and everything can affect the optimization strategy, leaving out stuff means that we may not be addressing your actual problem.

Knowing the table sizes is sometimes important in analyzing a situation like yours.

InnoDB is recommended for many reasons.
http://mysql.rjweb.org/doc.php/myisam2innodb

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