Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a84cb5fac35d102af9ae3085b2155a5663f31dd483359f1d701cbdc23fbe22c6' 
  AND token = 'SAmg4sD79uwLRcxqIyioV4VkmrIIPwXH40wfp+KRoI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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