Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '012ab56c1b76cc6d1213439decdbffd31216949abfabc17dbd9ac1d53a8b6076' 
  AND token = 'bRj+ja0/EDa0DlDRDf7L04+1CYJ1jRUkGBDouG3bRgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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