Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '103f4c37b5fc273baee1cbf0340494d5f144fccbd3c0907fb06a2d0faf4f5e59' 
  AND token = '5xHOk6rL4O6ZtKpA5ODIcXkA8+zf3EOzkjvluZcjIY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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