Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e5baa9d2af640aacecb8787c4ae2ffafe3803f349dccea8521e7ef596607574' 
  AND token = '+OKTCCu6xmSd5nhwyzny1XJE53JIJQTUtMr5WUuBBL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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