SET GLOBAL innodb_lock_wait_timeout=3;
CREATE TABLE t1 (col_int_key INT, KEY (col_int_key)) ENGINE=InnoDB;
INSERT INTO t1 VALUES (6);
SET SESSION TRANSACTION ISOLATION LEVEL SERIALIZABLE;
SET AUTOCOMMIT=OFF;
SELECT col_int_key FROM t1;
col_int_key
6
DELETE IGNORE FROM t1;;
DELETE FROM t1 WHERE col_int_key IN (1, 40000000);
drop table t1;
SET GLOBAL innodb_lock_wait_timeout=default;