MySQL 8.0

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CREATE TABLE admins (
id int NOT NULL AUTO_INCREMENT,
bez varchar(55) DEFAULT 'unknown',
type varchar(7) NOT NULL DEFAULT 'unknown',
exist char NOT NULL DEFAULT '0',
tm TIMESTAMP default CURRENT_TIMESTAMP,
PRIMARY KEY (id)
);
CREATE TRIGGER bu_if_exists
        BEFORE UPDATE
        ON admins FOR EACH ROW
    BEGIN
      IF NEW.exist = '1' THEN 
        SET NEW.tm = CURRENT_TIMESTAMP + 5;
      END IF;
    END;   
INSERT INTO admins (bez, type)
VALUES
('test1', 'test1'),
('test2', 'test2')
SELECT * FROM admins


id
bez
type
exist
tm


1
test1
test1
0
2022-09-01 16:42:40

2
test2
test2
0
2022-09-01 16:42:40


UPDATE admins SET exist='0' WHERE id='1'
SELECT * FROM admins


id
bez
type
exist
tm


1
test1
test1
0
2022-09-01 16:42:40

2
test2
test2
0
2022-09-01 16:42:40


UPDATE admins SET bez='test3' WHERE id='1'
SELECT * FROM admins


id
bez
type
exist
tm


1
test3
test1
0
2022-09-01 16:42:40

2
test2
test2
0
2022-09-01 16:42:40


UPDATE admins SET exist='1' WHERE id='1'
SELECT * FROM admins


id
bez
type
exist
tm


1
test3
test1
1
2022-09-01 16:42:45

2
test2
test2
0
2022-09-01 16:42:40

`id`	`bez`	`type`	`exist`	`tm`
`1`	`test1`	`test1`	`0`	`2022-09-01 16:42:40`
`2`	`test2`	`test2`	`0`	`2022-09-01 16:42:40`

`id`	`bez`	`type`	`exist`	`tm`
`1`	`test1`	`test1`	`0`	`2022-09-01 16:42:40`
`2`	`test2`	`test2`	`0`	`2022-09-01 16:42:40`

`id`	`bez`	`type`	`exist`	`tm`
`1`	`test3`	`test1`	`0`	`2022-09-01 16:42:40`
`2`	`test2`	`test2`	`0`	`2022-09-01 16:42:40`

`id`	`bez`	`type`	`exist`	`tm`
`1`	`test3`	`test1`	`1`	`2022-09-01 16:42:45`
`2`	`test2`	`test2`	`0`	`2022-09-01 16:42:40`