SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd380ef4ccfba3d65ef47b9ac6fb21b44b2838fa2d3fbee979549323b68e06065' 
  AND token = 'ZVGIJRsGQMBC0oY914enCnxRwhkn+qIsW+ge9dgVDbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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