Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fca3afa374cfbb55a35db00f0db9cc4ea08b035e8e9ced757aeab3cab4b5f1fb' 
  AND token = 'D9V8FIkEE7yim0ZMG2E+zfS31jKcSuRLkbJR4EgfBZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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