Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a231cc1c146c00a37216c4828e25e727cec3d39bbfab92bdd1ac1623a337223f' 
  AND token = 'BN+MmglATpTy5aIIwKIoJKxq79nfSezQeMqx/Vu7di4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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