Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '194ea135669ae4aea2e7eb6a6d05c943a50ac7014c31d42535796dd75d090e3c' 
  AND token = 'fgjSCc0WT8uEz5gcgz3f3RPYZLJdOchATdOUtg5rL4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}