Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd87fa99c3d88001d917051ecf89f3b18317bcba595962d6ab11784e8c93702e2' 
  AND token = 'XC3fSKa9cbg6VcefWmrheFWdZ3LS9p+3lWz61Uofavw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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