Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79714d3c53af0894d73908e8d3f04afc481534ccd2653bf7c586445caf628e09' 
  AND token = 'tRUqK0bW7SxrSNOun+U0TMP6mGIysUdkAsmvTzpaZ8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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