Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c660b76e1c497cdf7a7f6b8c837bf6c7636eb4bb413e8712c9146d1333d104e' 
  AND token = 'k21bSgoNPKf44sixttGJhIF/cDeWg1CBYuKlKsfxKnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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