Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea739c88dd718a88e7983fb617eb8e9f88bdd75fbd80e29f57e64819c8120dc8' 
  AND token = 'viD2FBsybSBgRm+plOQZEatqcw5Qo73d5vT/A3P67YU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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