Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ecac28c88f723ec4ef66ff192c3500a30435db436994db39f7501eaa4f4cce0' 
  AND token = 'YlygYlTrI9OLJTw3BDY2sgu2TnQFMXH0m5kLeildHuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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