In Kubernetes, how can I create a CronJob to test mysql database connectivity from a standard docker image?

Question

I'm trying to create a cronjob in EKS to test the database connection, but it's no working. I tried with the mysql-client docker image. This is the cronjob definition:

apiVersion: batch/v1beta1
kind: CronJob
metadata:
  name: mysql-test
  namespace: default
spec:
  schedule: "*/5 * * * *"
  jobTemplate:
    spec:
      template:
        spec:
          containers:
          - name: mysql
            image: imega/mysql-client
            command: ["mysql", "-xxxxxxx.us-east-1.rds.amazonaws.com", "-uxxxxxxx", "-pxxxxxxx", "-e'show databases;'"]
          restartPolicy: Never

But it's returning:

ERROR 1064 (42000) at line 1: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '`show databases;`' at line 1

Any idea?