FROM_BASE64('string')
FROM_BASE64 function in mysql is used to decode the encoded value. The value which is encode with the BASE64 rule to encode by the MySQL function TO_BASE64, is decoded by this FROM_BASE64 mysql function.
The argument which is passed with this function is a encoded string by BASE64 encoding rule.
HERE is some of example-
mysql> SELECT TO_BASE64('base64 encoded string');
-> YmFzZTY0IGVuY29kZWQgc3RyaW5n
mysql> SELECT TO_BASE64('abc'), FROM_BASE64(TO_BASE64('abc'));
-> 'JWJj', 'abc'
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