TIME_TO_SEC(time)
Returns the time argument, converted to seconds.
The value returned by TIME_TO_SEC is of type DOUBLE. Before MariaDB 5.3 (and MySQL 5.6), the type was INT. See Microseconds in MariaDB.
SELECT TIME_TO_SEC('22:23:00');
+-------------------------+
| TIME_TO_SEC('22:23:00') |
+-------------------------+
| 80580 |
+-------------------------+
SELECT TIME_TO_SEC('00:39:38');
+-------------------------+
| TIME_TO_SEC('00:39:38') |
+-------------------------+
| 2378 |
+-------------------------+
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https://mariadb.com/kb/en/time_to_sec/