Question about using indexes in different versions of MySQL?

Question

MySQL

There is a complex compound query of the form:

SELECT `c`.*, `r`.*, `ci`.*, `i`.*, `u`.*, `ca`.`Category_Weight` AS Category_Parent_Weight, `ca`.`Category_Alias` AS Category_Parent_Alias
FROM (`ct_items` i)
LEFT JOIN `ct_categories` c ON `i`.`Category_ID` = `c`.`Category_ID`
LEFT JOIN `ct_categories` ca ON `c`.`Category_Group_Id` = `ca`.`Category_ID`
LEFT JOIN `ct_regions` r ON `i`.`Region_ID` = `r`.`Region_ID`
LEFT JOIN `ct_cities` ci ON `i`.`City_ID` = `ci`.`City_ID`
LEFT JOIN `ct_users` u ON `i`.`User_ID` = `u`.`id`
WHERE `Item_status` =  'active'
AND `User_ID` =  '1'
AND `Item_ID` <> '5869135'
LIMIT 4

The database on the servers is exactly the same, the ct_items table is 6 million records, the MyISAM engine.
The 1st server has Percona Server (GPL), Release 11, Revision f60191c (5.7.17-11-
log

) )
explain:

Why the Account_ID index is not used on the second server, but "Using index condition; Using where; Using MRR"
and the number of rows in the first case is 4, and in the second 6 million. Because of this, this query on the second server is very strong slows down...