Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c7f527a0fcbebe7a290d2e35c51b9669125471eb8ac4aa11978ecbbd5fb77a4' 
  AND token = 'O4LeZsgyF8DXZKbQ/Y9OLXjhB2wtkXg5odk0Eak5d1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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