When importing a dump created by mysqldump with default options meta-data like Rows and Avg_row_length are 0 and Data_length is 16 KB and indexes are not available anymore which leads to long running or locking queries. Only after executing an optimize table afterwards corrects this or whem using the option skip-disable-keys for creating dump.

In the following example the Data_length is always 16 KB, because of the small table:

Test Table
mysql -e 'CREATE DATABASE testdb;'
mysql testdb -e 'CREATE TABLE testtable ( id int, a int,PRIMARY KEY (id)) ENGINE=InnoDB;'
mysql testdb -e 'INSERT INTO testtable VALUES (1,2),(2,3),(3,4);'

Import with default dump
mysqldump testdb testtable > dump1.sql
mysql -e 'DROP DATABASE IF EXISTS testdb;CREATE DATABASE testdb;'
mysql testdb < dump1.sql
mysql testdb -e 'SHOW TABLE STATUS LIKE "testtable"\G'

Rows: 0
Avg_row_length: 0

Recreate Table
mysql testdb -e 'OPTIMIZE TABLE testtable;'
mysql testdb -e 'SHOW TABLE STATUS LIKE "testtable"\G'

Rows: 3
Avg_row_length: 5461

Import with dump without disabled keys
mysqldump --skip-disable-keys testdb testtable > dump2.sql
mysql -e 'DROP DATABASE IF EXISTS testdb;CREATE DATABASE testdb;'
mysql testdb < dump2.sql
mysql testdb -e 'SHOW TABLE STATUS LIKE "testtable"\G'

Rows: 3
Avg_row_length: 5461