mysql> ALTER USER 'testuser'@'localhost' PASSWORD EXPIRE;

mysql> SHOW DATABASES;
ERROR 1820 (HY000): You must SET PASSWORD before executing this statement
Keep in mind that this does not affect any current connections the account has open.

mysql> SET PASSWORD=PASSWORD('mechipoderranen');
Query OK, 0 rows affected (0.00 sec)
mysql> SHOW DATABASES;
+--------------------+
| Database      |
+--------------------+
| information_schema |
| data        |
| logs        |
| mysql       |
| performance_schema |
| test        |
+--------------------+
6 rows in set (0.00 sec)
mysql>

[mysqld]
default_password_lifetime=90

[mysqld]
default_password_lifetime=0

mysql> SET GLOBAL default_password_lifetime = 90;
Query OK, 0 rows affected (0.00 sec)

ALTER USER ‘testuser'@‘localhost' PASSWORD EXPIRE INTERVAL 30 DAY;

ALTER USER 'testuser'@'localhost' PASSWORD EXPIRE NEVER;

ALTER USER 'testuser'@'localhost' PASSWORD EXPIRE DEFAULT;

mysql> ALTER USER USER() IDENTIFIED BY '637h1m27h36r33K';
Query OK, 0 rows affected (0.00 sec)

mysql> CREATE USER 'furrywall'@'localhost' IDENTIFIED BY '71m32ch4n6317' ACCOUNT LOCK;
Query OK, 0 rows affected (0.00 sec)

$ mysql -ufurrywall -p
Enter password:
ERROR 3118 (HY000): Access denied for user 'furrywall'@'localhost'. Account is locked.

mysql>ALTER USER 'furrywall'@'localhost' ACCOUNT UNLOCK;
Query OK, 0 rows affected (0.00 sec)

$ mysql -ufurrywall -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or g.
Your MySQL connection id is 17
Server version: 5.7.8-rc MySQL Community Server (GPL)
Copyright (c) 2000, 2015, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or 'h' for help. Type 'c' to clear the current input statement.
mysql>

mysql> ALTER USER 'furrywall'@'localhost' ACCOUNT LOCK;
Query OK, 0 rows affected (0.00 sec)