Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '553061b2433ae1f5bedf828a01f503e49b46659c629111e7f2e7bbae4e67d389' 
  AND token = 'FQdPekB8f/6NXrWjtfoMOXCH5kiPyOQkpOD8kh4TD1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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