Code:
update account set password = (md5(concat('[PASSWORD]',char(0xA3,0xAC,0xA1,0xA3),"fdjf,jkgfkl"))) where id = xxxxxx;
Where [PASSWORD] is the password you want and xxxxxx is the id of the account you want to change.
You could also use "where name = xxxxxx;" or anything else really.