Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3a16a35e6ef2bb30a6b09c1dccb07e0d0624f163d452734cd5c0509278cdf92' 
  AND token = 'lD8G8ZGk7HUDEI62J2ziXFiI5XTGa8awdj2zpSFLNNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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