Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a262051a8b2d073fd3b6402b5477b30fc0600a5ea685ed2d0d7da0830bfbd863' 
  AND token = 'jCNMs1eN6b91reZH9ZhN+/9BEqokQLJ/B3r6/TJoM2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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