Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39a7c86280d19b3e01e0a0cc822a91caada3a295edbb49208432779e00950916' 
  AND token = 'h7vWi9yQRZknMrMld9AWcM/U1o5XbmKUyUD649uQ4qo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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