SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae34d0fb449d2c67ed07e6c15003f433243e4559375fc863f0289691160404cf' 
  AND token = 'StvIPv5poDHBaw4OP7w+z9pJjRKU+wm9hAo4vEwXYCU=' 
  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"
    }
  }
}