My query returns empty results with big tables. Any advice?

Change maximum execution time in xampp/phpmyadmin/libraries/config_default.php
$cfg['ExecTimeLimit'] = 300; to $cfg['ExecTimeLimit'] = 0;
/**
* maximum execution time in seconds (0 for no limit)
*
* @global integer $cfg['ExecTimeLimit']
*/
$cfg['ExecTimeLimit'] = 0;