Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4aa0a85f340fa3f3e1db231e0d16fe51d0f6f4f9511891a9994cf2acb9c74b8' 
  AND token = 'l7OVsf7OlUec3q1HBBG2zUQNV+hZOKtvuZnhIfJe5kA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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