Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b72777eadaaaef1c52aaa7324e23c9ef1274e191d1f62e370e43e3b9c5a6bfc7' 
  AND token = '6mW4qx4EBskPupkLRD3vXkiDtR6SXMZBJfrtZpJJrQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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