Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dce0c5e0a9c66899ec96b6813db399d4b46deebe904163d1ee6de377b86c248' 
  AND token = 'uQf+prvRE9mwkI90M3xBrbUNjK4ABWVnPZoUaCTD7aM=' 
  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"
    }
  }
}