SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1807f831f63986fadfc7d0d41e0e6ce903e66d376a72635b7b9998ca216ac4cb' 
  AND token = 'r2PdjP9nnIYPGJBzvUvjA008JK0f4qGDTui5m8hr/9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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