Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0ccefd9da22421b02560164457fb5dc9820b6e3a80ffc1495819eaf0d6750d8' 
  AND token = 'B/e+AImjtQO99Pua91TFWi15SfQ8cOhMv3NxpTlVpYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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