SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a13454a0637734028236233f829355b1f649a0e2bc1d47a07c911d2f628da19' 
  AND token = 'ZFTjfqCyTnHbK0bKCVI1LXM0pwNpZVVLCHXrJYD2z+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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