Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09bc723095bfb51509feb7ec3e4233fb8163ed9fd55eee135a914fa2b56afebd' 
  AND token = 'MTrulBMkIBCyhPcvSmoo7bbF7m8lGlNOUyMQboNugfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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