Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baa00369d07f4da5c01f2028683ab59c12f7ece05bc4619c2a86f8a40c1460a1' 
  AND token = 'g6E6/JYc6rXGyWHYRvCfdshaMcqHYtsP0CxQugTqKzo=' 
  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"
    }
  }
}