Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e6845b3b98740d4b914d41b8f1fb3df85863bedf83cdb903828e9a27c8c8e6c' 
  AND token = 'eVrKPIMFsy1jdyBFotTN8DeM1mdQX7sAQbkKGONPmnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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