Does mysql covering index follow leftmost index prefix?

Question

AS I know, the multiple-column indexes should follow leftmost prefix principle.

And as the mysql documention: The optimizer attempts to use additional key parts to determine the interval as long as the comparison operator is =, <=>, or IS NULL. If the operator is >, <, >=, <=, !=, <>, BETWEEN, or LIKE, the optimizer uses it but considers no more key parts.

But I find the convering index does not follow leftmost prefix .

for example:

mysql 5.6.16

show create table t_covering_index\G
*************************** 1. row ***************************
Table: t_covering_index
Create Table: CREATE TABLE t_covering_index ( id bigint(20) NOT NULL AUTO_INCREMENT, col1 varchar(255) DEFAULT NULL, col2 bigint(20) NOT NULL DEFAULT '0', col3 bigint(20) DEFAULT '0', col4 bigint(20) DEFAULT '0', col5 int(11) DEFAULT '0', col6 bigint(20) DEFAULT '0', col7 varchar(32) DEFAULT NULL, col8 int(11) DEFAULT NULL, col9 datetime NOT NULL DEFAULT CURRENT_TIMESTAMP, PRIMARY KEY (id), KEY idx_col7_col9_col8_col6 (col7,col9,col8,col6) ) ENGINE=InnoDB AUTO_INCREMENT=1024 DEFAULT CHARSET=utf8

explain select col6 from t_covering_index where col7='10060000041162' and col9>='2019-02-01' and col9< '2019-02-28' and col8=1;
+----+-------------+------------------+-------+-------------------------+-------------------------+---------+------+------+--------------------------+ | id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra | +----+-------------+------------------+-------+-------------------------+-------------------------+---------+------+------+--------------------------+ | 1 | SIMPLE | t_covering_index | range | idx_col7_col9_col8_col6 | idx_col7_col9_col8_col6 | 109 | NULL | 2 | Using where; Using index | +----+-------------+------------------+-------+-------------------------+-------------------------+---------+------+------+--------------------------+ 1 row in set (0.01 sec)

explain select col6 from t_covering_index where col9>='2019-02-01' and col9< '2019-02-28' and col8=1;
+----+-------------+------------------+-------+---------------+-------------------------+---------+------+------+--------------------------+ | id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra | +----+-------------+------------------+-------+---------------+-------------------------+---------+------+------+--------------------------+ | 1 | SIMPLE | t_covering_index | index | NULL | idx_col7_col9_col8_col6 | 118 | NULL | 371 | Using where; Using index | +----+-------------+------------------+-------+---------------+-------------------------+---------+------+------+--------------------------+ 1 row in set (0.01 sec)

INSERT INTO t_covering_index VALUES (91,'30061901301897673663',0,0,0,1,0,'10060000028619',1,'2019-01-30 19:35:05'),(124,'30061902040091016037',0,0,0,1,0,'10060000032601',1,'2019-02-13 14:44:22'),(140,'30061902131071212621',-3000,-3000,0,1,0,'10060000035146',1,'2019-02-13 18:56:21'),(150,'30061902132224866441',0,0,0,1,0,'10060000037174',1,'2019-02-13 23:00:23'),(154,'30061902132225051119',0,0,0,1,0,'10060000037161',1,'2019-02-13 23:03:22'),(174,'30061902132337694942',2000,2000,0,1,0,'10060000037189',1,'2019-02-13 23:47:28'),(175,'30061902132337694942',0,0,0,1,0,'10060000037189',1,'2019-02-13 23:55:15'),(176,'30061902132337694942',0,0,0,1,0,'10060000037189',1,'2019-02-13 23:55:15'),(178,'30061902132249641789',0,0,0,1,0,'10060000037173',1,'2019-02-14 11:28:19'),(179,'30061902132355414357',0,0,0,1,0,'10060000037181',1,'2019-02-14 11:28:23'),(180,'30061902132355414357',0,0,0,1,0,'10060000037181',1,'2019-02-14 11:28:23'),(181,'30061902132355414357',0,0,0,1,0,'10060000037181',1,'2019-02-14 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