Query on partition with like take forever

HI, I created a table like this:

Create Table: CREATE TABLE `cdr_03` (
  `TimeStamp` datetime DEFAULT NULL,
  `Ses` varchar(10) DEFAULT NULL,
  `Session` varchar(50) DEFAULT NULL,
  `IP` varchar(20) DEFAULT NULL,
  `IMSI` varchar(30) DEFAULT NULL,
  `APN` varchar(300) DEFAULT NULL,
  `MCC` int(11) DEFAULT NULL,
  `MNC` int(11) DEFAULT NULL,
  `ECGI` int(11) DEFAULT NULL,
  `TAI` int(11) DEFAULT NULL,
  `NAS` varchar(30) DEFAULT NULL,
  `IMEI` varchar(30) DEFAULT NULL,
  `UPD` datetime DEFAULT NULL,
  KEY `IP` (`IP`),
  KEY `IMSI` (`IMSI`),
  KEY `APN` (`APN`),
  KEY `IMEI` (`IMEI`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1
 PARTITION BY HASH (to_days(`TimeStamp`))
PARTITIONS 2300

then I loaded about 600 partitions with 2M records each.

using this query:

select * from cdr_03 where TimeStamp >= "2018-01-01 00:00:00" 
  and TimeStamp <= "2018-01-01 23:59:59" and IP = "343.456.989.659";

I get a reply with one record in about 8 seconds.

using this query:

select * from cdr_03 where TimeStamp >= "2018-01-01 00:00:00" 
  and TimeStamp <= "2018-01-01 23:59:59" and IP like "343.456.989.65%";

after 48 hours the query still running. There is only 1 record in that interval and the wild card is covering only 1 char.

From the documentation I read the like will use the partitioning and also the index, so I cannot understand why is not working. Thanks