Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0742443f96e71922241e09d5b4f8c77845a12dc533eea5defce61b3dcf0e5aa' 
  AND token = 'LXp4i+CbnqDqLA5XuF6utDtE7raL63X1cuN1b5WIrdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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