Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb175fa0b0b35a84d53eae03adb2b9495d27af26e0f7f9037803f66b750f19e2' 
  AND token = 'OJRTv+UBiQlQz6//0vWu8vAB2qx0vuzkzeFBdWeJD9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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