Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd616b3691ad2e0ec25393676d304ac8a9ef7e3cd5217004368924eb939ff821' 
  AND token = '8GCAAhuebv3YWXAK/KAGvkn7m5N4L0+13xlW+U1tb1E=' 
  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"
    }
  }
}