Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfdd61c412629df51b8d71ee9f032dcf0bc5fa3bd45fb4dcf77d63306a2c6fa1' 
  AND token = '2e1zcR3k8ppCmCHJGtc11tqIFKRSi8g9quB45ezlRQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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