Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83eb12e8a56c44eb8759b3fbb506b172203dd8d9f5b2cd24f99cc8d7fe280cd5' 
  AND token = 'wRQP1Hvk0sggRWHPSlLCu8Nr0MmBRWBUGcUDPADHx2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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